Interrupt List, part 4 of 12
This compilation is Copyright (c) 1989,1990,1991,1992,1993,1994,1995 Ralf Brown
--------X-1AB000-----------------------------
INT 1A U - HP 100LX/200LX - PCMCIA - ???
	AX = B000h
	ES:BX -> parameter block ???
Return: CF clear if ???
	CF set if ???
Note:	called by HP 100LX/200LX PCMCIA client CIC100.EXE
--------d-1AB001CX4D52-----------------------
INT 1A - Microsoft Real-Time Compression Interface (MRCI) - ROM-BASED SERVER
	AX = B001h
	CX = 4D52h ("MR")
	DX = 4349h ("CI")
Return: CX = 4943h ("IC") if installed
	DX = 524Dh ("RM") if installed
	    ES:DI -> MRCINFO structure (see #0544)
Note:	this call is functionally identical to INT 2F/AX=4A12h, which should
	  be called first, as this call is used for the first, ROM-based
	  MRCI server, while the other call is used for RAM-based servers
	  which may be partially or entirely replacing a prior server
SeeAlso: INT 2F/AX=4A12h

Format of MRCINFO structure:
Offset	Size	Description	(Table 0544)
 00h  4 BYTEs	vendor signature
		"MSFT" Microsoft
 04h	WORD	server version (high=major)
 06h	WORD	MRCI specification version
 08h	DWORD	address of server entry point (see #0546)
 0Ch	WORD	bit flags: server capabilities (see #0545)
 0Eh	WORD	bit flags: hardware assisted capabilities (see #0545)
 10h	WORD	maximum block size supported by server (at least 8192 bytes)

Bitfields for MRCI capabilities:
Bit(s)	Description	(Table 0545)
 0	standard compress
 1	standard decompress
 2	update compress
 3	MaxCompress (not present in initial public release)
 4	reserved
 5	incremental decompress
 6	MRCI 2.0 standard compress
 7	MRCI 2.0 standard decompress
 8-14	reserved
 15	this structure is in ROM and can't be modified
	(server capabilities only)

(Table 0546)
Call MRCI entry point with:
	DS:SI -> MRCREQUEST structure (see #0547)
	CX = type of client (0000h application, 0001h file system)
	AX = operation
	    0001h perform standard compression
	    0002h perform standard decompression
	    0004h perform update compression
	    0008h perform MaxCompress
	    0020h perform incremental decompression
	    0040h perform MRCI 2.0 standard compression
	    0080h perform MRCI 2.0 standard decompression
	AX = FFFFh clear flags
	    BX = bitmask of flags to clear (set bits in BX are flags to clear)
Return: AX = status
	    0000h successful
	    0001h invalid function
	    0002h server busy, try again
	    0003h destination buffer too small
	    0004h incompressible data
	    0005h bad compressed data format
	BP destroyed (MS-DOS 6.2)
Note:	MRCI driver may chain to a previous driver

Format of MRCREQUEST structure:
Offset	Size	Description	(Table 0547)
 00h	DWORD	pointer to source buffer
 04h	WORD	size of source buffer (0000h = 64K)
 06h	WORD	(UpdateCompress only)
		(call) offset in source buffer of beginning of changed data
		(ret) offset in destination buffer of beginning of changed
			  compressed data
 08h	DWORD	pointer to destination buffer
		must contain original compressed data for UpdateCompress
 0Ch	WORD	size of destination buffer (0000h = 64K)
		any compression: size of buffer for compressed data
		standard decompression: number of bytes to be decompressed
		incremental decompression: number of byte to decompress now
		(ret) actual size of resulting data
 0Eh	WORD	client compressed data storage allocation size
 10h	DWORD	incremental decompression state data
		set to 00000000h before first incremental decompression call
Notes:	the source and destination buffers may not overlap
	the source and destination buffer sizes should normally be the same
	application should not update the contents of the MRCREQUEST structure
	  between incremental decompression calls
--------X-1AB101-----------------------------
INT 1A - Intel PCI BIOS v2.0c - INSTALLATION CHECK
	AX = B101h
Return: AH = 00h if installed
	    CF clear
	    EDX = 20494350h (' ICP')
	    EDI = physical address of protected-mode entry point (see #0550)
	    AL = PCI hardware characteristics (see #0549)
	    BH = PCI interface level major version (BCD)
	    BL = PCI interface level minor version (BCD)
	    CL = number of last PCI bus in system
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Note:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
SeeAlso: AX=B181h

(Table 0548)
Values for PCI BIOS v2.0c status codes:
 00h	successful
 81h	unsupported function
 83h	bad vendor ID
 86h	device not found
 87h	bad PCI register number

Bitfields for PCI hardware characteristics:
Bit(s)	Description	(Table 0549)
 0	configuration space access mechanism 1 supported
 1	configuration space access mechanism 2 supported
 2-3	reserved
 4	Special Cycle generation mechanism 1 supported
 5	Special Cycle generation mechanism 2 supported
 6-7	reserved

(Table 0550)
Call protected-mode entry point with:
	registers as for real/V86-mode INT call
	CS = ring 0 descriptor with access to full address space
Return: as for real/V86-mode call
--------X-1AB102-----------------------------
INT 1A - Intel PCI BIOS v2.0c - FIND PCI DEVICE
	AX = B102h
	CX = device ID
	DX = vendor ID
	SI = device index (0-n)
Return: CF clear if successful
	CF set on error
	AH = status (00h,83h,86h) (see #0548)
	    00h successful
		BH = bus number
		BL = device/function number (bits 7-3 device, bits 2-0 func)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	device ID FFFFh may be reserved as a wildcard in future implementations
	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
	all devices sharing a single vendor ID and device ID may be enumerated
	  by incrementing SI from 0 until error 86h is returned
SeeAlso: AX=B182h
--------X-1AB103-----------------------------
INT 1A - Intel PCI BIOS v2.0c - FIND PCI CLASS CODE
	AX = B103h
	ECX = class code (bits 23-0)
	    xx400000h = multimedia device, video subclass
	    xx408000h = multimedia device, other multimedia device
	SI = device index (0-n)
Return: CF clear if successful
	CF set on error
	AH = status (00h,86h) (see #0548)
	    00h successful
		BH = bus number
		BL = device/function number (bits 7-3 device, bits 2-0 func)
	    86h device not found
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
	all devices sharing the same Class Code may be enumerated by
	  incrementing SI from 0 until error 86h is returned
SeeAlso: AX=B183h
--------X-1AB106-----------------------------
INT 1A - Intel PCI BIOS v2.0c - PCI BUS-SPECIFIC OPERATIONS
	AX = B106h
	BL = bus number
	EDX = Special Cycle data
Return: CF clear if successful
	CF set on error
	AH = status (00h,81h) (see #0548)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Note:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
SeeAlso: AX=B186h
--------X-1AB108-----------------------------
INT 1A - Intel PCI BIOS v2.0c - READ CONFIGURATION BYTE
	AX = B108h
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	BH = bus number
	DI = register number (0000h-00FFh)
Return: CF clear if successful
	    CL = byte read
	CF set on error
	AH = status (00h,87h) (see #0548)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	the meanings of BL and BH on entry were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B188h
--------X-1AB109-----------------------------
INT 1A - Intel PCI BIOS v2.0c - READ CONFIGURATION WORD
	AX = B109h
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	BH = bus number
	DI = register number (0000h-00FFh)
Return: CF clear if successful
	    CX = word read
	CF set on error
	AH = status (00h,87h) (see #0548)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	the meanings of BL and BH on entry were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B189h
--------X-1AB10A-----------------------------
INT 1A - Intel PCI BIOS v2.0c - READ CONFIGURATION DWORD
	AX = B10Ah
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (0000h-00FFh)
Return: CF clear if successful
	    ECX = dword read
	CF set on error
	AH = status (00h,87h) (see #0548)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	the meanings of BL and BH on entry were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B18Ah
--------X-1AB10B-----------------------------
INT 1A - Intel PCI BIOS v2.0c - WRITE CONFIGURATION BYTE
	AX = B10Bh
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (0000h-00FFh)
	CL = byte to write
Return: CF clear if successful
	CF set on error
	AH = status (00h,87h) (see #0548)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	the meanings of BL and BH on entry were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B18Bh
--------X-1AB10C-----------------------------
INT 1A - Intel PCI BIOS v2.0c - WRITE CONFIGURATION WORD
	AX = B10Ch
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (multiple of 2 less than 0100h)
	CX = word to write
Return: CF clear if successful
	CF set on error
	AH = status (00h,87h) (see #0548)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	the meanings of BL and BH on entry were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B18Ch
--------X-1AB10D-----------------------------
INT 1A - Intel PCI BIOS v2.0c - WRITE CONFIGURATION DWORD
	AX = B10Dh
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (multiple of 4 less than 0100h)
	ECX = dword to write
Return: CF clear if successful
	CF set on error
	AH = status (00h,87h) (see #0548)
	EAX, EBX, ECX, and EDX may be modified
	all other flags (except IF) may be modified
Notes:	this function may require up to 1024 byte of stack; it will not enable
	  interrupts if they were disabled before making the call
	the meanings of BL and BH on entry were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B18Dh
--------X-1AB181-----------------------------
INT 1A - Intel PCI BIOS v2.0c - INSTALLATION CHECK (32-bit)
	AX = B181h
Return: as for AX=B101h
SeeAlso: AX=B101h
--------X-1AB182-----------------------------
INT 1A - Intel PCI BIOS v2.0c - FIND PCI DEVICE (32-bit)
	AX = B182h
	CX = device ID
	DX = vendor ID
	SI = device index (0-n)
Return: as for AX=B102h
SeeAlso: AX=B102h
--------X-1AB183-----------------------------
INT 1A - Intel PCI BIOS v2.0c - FIND PCI CLASS CODE (32-bit)
	AX = B183h
	ECX = class code (bits 23-0)
	SI = device index (0-n)
Return: as for AX=B103h
SeeAlso: AX=B103h
--------X-1AB186-----------------------------
INT 1A - Intel PCI BIOS v2.0c - PCI BUS-SPECIFIC OPERATIONS (32-bit)
	AX = B186h
	BH = bus number
	EDX = Special Cycle data
Return: as for AX=B106h
Note:	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B106h
--------X-1AB188-----------------------------
INT 1A - Intel PCI BIOS v2.0c - READ CONFIGURATION BYTE (32-bit)
	AX = B188h
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (0000h-00FFh)
Return: as for AX=B108h
Note:	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B108h
--------X-1AB189-----------------------------
INT 1A - Intel PCI BIOS v2.0c - READ CONFIGURATION WORD (32-bit)
	AX = B189h
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (0000h-00FFh)
Return: as for AX=B109h
Note:	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B109h
--------X-1AB18A-----------------------------
INT 1A - Intel PCI BIOS v2.0c - READ CONFIGURATION DWORD (32-bit)
	AX = B18Ah
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (0000h-00FFh)
Return: as for AX=B10Ah
Note:	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B10Ah
--------X-1AB18B-----------------------------
INT 1A - Intel PCI BIOS v2.0c - WRITE CONFIGURATION BYTE (32-bit)
	AX = B18Bh
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (0000h-00FFh)
	CL = byte to write
Return: as for AX=B10Bh
Note:	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B10Bh
--------X-1AB18C-----------------------------
INT 1A - Intel PCI BIOS v2.0c - WRITE CONFIGURATION WORD (32-bit)
	AX = B18Ch
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (multiple of 2 less than 0100h)
	CX = word to write
Return: as for AX=B10Ch
Note:	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B10Ch
--------X-1AB18D-----------------------------
INT 1A - Intel PCI BIOS v2.0c - WRITE CONFIGURATION DWORD (32-bit)
	AX = B18Dh
	BH = bus number
	BL = device/function number (bits 7-3 device, bits 2-0 function)
	DI = register number (multiple of 4 less than 0100h)
	ECX = dword to write
Return: as for AX=B10Dh
Note:	the meanings of BL and BH on return were exchanged between the initial
	  drafts of the specification and final implementation
SeeAlso: AX=B10Dh
--------X-1AB400-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - INSTALLATION CHECK
	AX = B400h
Return: CF clear if installed
	AX = 0000h if installed
	    BH = ??? (02h)
	    BL = ??? (08h)
	    CX = ??? (0002h)
	    EDX = 47464341h ('GFCA', which is byte-swapped 'ACFG')
	    SI = ??? (001Fh)
SeeAlso: AX=B401h,AX=B402h,AX=B403h,AX=B404h,AX=B405h,AX=B406h,AX=B407h
SeeAlso: @xxxxh:xxxxh"Plug-and-Play"

(Table 0551)
Values for Intel Plug-and-Play AUTO-CONFIGURATION error codes:
 0000h	successful
 0051h	???
 0055h	unable to read/write configuration table from/to nonvolatile storage
 0056h	not a valid configuration table or wrong table version
 0059h	buffer too small
 FFFFh	???
--------X-1AB401-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - GET DEFAULT CONFIG TABLE
	AX = B401h
Return: CF clear if successful
	    AX = 0000h
	    BX = maximum size of configuration table??? (1000h)
	    CX = ??? (2000h)
	    EDI = linear/physical address of ESCD table (see #0552)
	CF set on error
	    AX = error code (see #0551)
SeeAlso: AX=B400h,AX=B402h,@xxxxh:xxxxh"Plug-and-Play"

Format of Intel Plug-and-Play Extended System Configuration Data table:
Offset	Size	Description	(Table 0552)
 00h	WORD	total length of this table
 02h  4 BYTEs	signature "ACFG"
 06h	BYTE	minor version number
 07h	BYTE	major version number (currently 02h)
 08h	BYTE	number of boards listed in the configuration data
 09h  3 BYTEs	reserved (00h)
 0Ch	var	board data
	WORD	checksum
Notes:	this table contains information about the standard devices in the
	  system, such as serial ports, parallel ports, etc.  For each device,
	  it includes at least the I/O port address (03F8h,02F8h,0378h,etc).
	the sum of all words in the table, including the checksum field (with
	  implied zero padding if the length is odd), must equal 0000h
SeeAlso: #0553

Format of Extended System Configuration Data Board Header:
Offset	Size	Description	(Table 0553)
 00h	WORD	length of this header in bytes
 02h	BYTE	slot number
		00h motherboard
		01h-0Fh ISA/EISA
		10h-40h	PCI
 03h	BYTE	reserved (00h)
SeeAlso: #0552,#0554

Format of Extended System Configuration Data Freeform Board Header:
Offset	Size	Description	(Table 0554)
 00h  4 BYTEs	signature "ACFG"
 04h	BYTE	minor version number
 05h	BYTE	major version number (currently 02h)
 06h	BYTE	board type
		01h ISA
		02h EISA
		04h PCI
		08h PCMCIA
		10h PnPISA
		20h MCA
 07h	BYTE	reserved (00h)
 08h	WORD	disabled functions (bit N set = function N disabled)
 0Ah	WORD	configuration error functions
 0Ch	WORD	reconfigurable functions (bit N set = function N reconfig'able)
 0Eh  2 BYTEs	reserved (00h)
SeeAlso: #0557,#0558

Format of Extended System Configuration Data Freeform PCI Device Data:
Offset	Size	Description	(Table 0555)
 00h	BYTE	PCI bus number
 01h	BYTE	PCI device and function number
 02h	WORD	PCI device identifier
 04h	WORD	PCI vendor ID
		1002h = ATI
 06h  2 BYTEs	reserved (00h)
SeeAlso: #0555,#0558

Format of Extended System Configuration Data Freeform PnP ISA Board ID:
Offset	Size	Description	(Table 0556)
 00h	DWORD	vendor ID (EISA device identifier)
 04h	DWORD	serial number
SeeAlso: #0556,#0557

Format of Extended System Configuration Data PnP ISA ECD Extension Function:
Offset	Size	Description	(Table 0557)
 00h	WORD	001Eh (length of this structure)
 02h	BYTE	01h (selection size)
 03h	BYTE	00h (selection data)
 04h	BYTE	C0h (function information byte) (see #0560)
 05h	BYTE	18h (size of following free-format data)
 06h 16 BYTEs	freeform board header (see #0554)
 16h  8 BYTEs	Plug-and-Play board ID (see #0556)
Note:	ECD = Extended Configuration Data; this structure must be the last
	  "function" for a particular ISA Plug-and-Play board
SeeAlso: #0558

Format of Extended System Configuration Data PCI ECD Extension Function:
Offset	Size	Description	(Table 0558)
 00h	WORD	length of this structure (at least 001Eh, up to 0056h)
 02h	BYTE	01h (selection size)
 03h	BYTE	00h (selection data)
 04h	BYTE	C0h (function information byte) (see #0560)
 05h	BYTE	size of following free-format data (at least 18h, max 50h)
 06h 16 BYTEs	freeform board header (see #0554)
 16h 8N BYTEs	PCI board ID (see #0555) for one to eight boards
Notes:	ECD = Extended Configuration Data; this structure must be the last
	  "function" for a particular PCI board
	AMI BIOS v1.00.05.AX1 sets the length field to 001Ch for entries with
	  a single board ID, apparently treating the field as the length of
	  the remainder of the structure instead of the full structure's length
SeeAlso: #0557

Bitfields for EISA ID and Slot Information:
Bit(s)	Description	(Table 0559)
 3-0	selector among duplicate configuration file names (0000 if no dups)
 5-4	slot type
	00 expansion slot
	01 embedded
	10 virtual slot
	11 reserved
 6	ID is readable
 7	duplicate IDs present
 8	board can be disabled
 9	IOCHKERR supported
 10	board or entries locked
 13-11	reserved
 14	board does not have or need configuration file
 15	configuration not complete
SeeAlso: #0560

Bitfields for EISA Function Information:
Bit(s)	Description	(Table 0560)
 0	subtype data
 1	memory information (see #0561)
 2	IRQ information (see #0563)
 3	DMA information (see #0564)
 4	port range information (see #0565)
 5	port initialization data (see #0566)
 6	free form data
 7	function disabled
SeeAlso: #0557,#0558,#0559 

Format of EISA Memory Information:
Offset	Size	Description	(Table 0561)
 00h	WORD	memory information flags (see #0562)
 02h  3 BYTEs	high 24 bits of memory start address (LSB first)
 05h	WORD	memory size in K (0000h = 65536K)
SeeAlso: #0560

Bitfields for EISA Memory Information Flags:
Bit(s)	Description	(Table 0562)
 0	writable (RAM rather than ROM)
 1	cached
 2	write-back cache rather than write-through
 4-3	memory type
	00 system
	01 expantion
	10 virtual
	11 other
 5	shared
 6	reserved (0)
 7	more entries follow
 9-8	memory width
	00 byte
	01 word
	10 dword
	11 reserved
 11-10	decoded address lines
	00 = 20
	01 = 24
	10 = 32
	11 reserved
 15-12	reserved (0)
SeeAlso: #0561

Bitfields for EISA IRQ Information:
Bit(s)	Description	(Table 0563)
 3-0	IRQ number
 4	reserved (0)
 5	IRQ triggering (0 = edge, 1 = level)
 6	IRQ is shareable
 7	more entries follow
 15-8	reserved (0)
SeeAlso: #0560

Bitfields for EISA DMA Information:
Bit(s)	Description	(Table 0564)
 2-0	DMA channel number
 5-3	reserved (0)
 6	shareable
 7	more entries follow
 9-8	reserved
 11-10	DMA transfer size
	00 byte
	01 word
	10 dword
	11 word, but count in bytes
 13-12	DMA timing
	00 ISA-compatible
	01 EISA type "A"
	10 EISA type "B"
	11 EISA type "C"/"F" (burst)
 15-14	reserved (0)
SeeAlso: #0560

Format of EISA Port Range Information:
Offset	Size	Description	(Table 0565)
 00h	BYTE	port description
		bits 4-0: number of sequential ports
		bit 5 reserved (0)
		bit 6: shareable
		bit 7: more entries follow
 01h	WORD	I/O port address
SeeAlso: #0560,#0566

Format of EISA Port Initialization Data:
Offset	Size	Description	(Table 0566)
 00h	BYTE	flags
		bits 1-0: port size
			00 byte
			01 word
			10 dword
			11 reserved
		bit 2: masked write
		bits 6-3 reserved (0)
		bit 7: more entries follow
 01h	???
SeeAlso: #0560,#0565
--------X-1AB402-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - COPY AND VERIFY CONFIG TABLE
	AX = B402h
	DS:SI -> configuration table (see #0552)
	ES:DI -> buffer for copy of configuration table
Return: CF clear if successful
	    AX = 0000h
	CF set on error
	    AX = error code (0055h,0056h) (see #0551)
Note:	the buffer pointed at by ES:DI must be at least as large as the
	  maximum configuration table size reported by AX=B401h
SeeAlso: AX=B400h,AX=B401h
--------X-1AB403-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - ???
	AX = B403h
	DS:SI -> configuration table (see #0552)
Return: CF clear if successful
	    AX = 0000h
	CF set on error
	    AX = error code (0055h) (see #0551)
Note:	sets the configuration table's checksum field, then ???
SeeAlso: AX=B400h
--------X-1AB404-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - ???
	AX = B404h
	BX = ???
Return: CF clear if successful
	    AX = 0000h
	    BX = ???
	    CX = ???
	    DX = ???
	CF set on error
	    AX = error code (0051h) (see #0551)
SeeAlso: AX=B400h
--------X-1AB405-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - GET ???
	AX = B405h
Return: AX = ??? (0008h)
SeeAlso: AX=B400h
--------X-1AB406-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - GET ???
	AX = B406h
	ES:DI -> ??? header (see #0567)
Return: CF clear if successful
	    AX = 0000h
	    WORD ES:[DI] = size of returned data
	CF set on error
	    AX = error code (0059h) (see #0551)
	    WORD ES:[DI] = required size of buffer
SeeAlso: AX=B400h

Format of Intel Plug-and-Play AUTO-CONFIGURATION ??? header:
Offset	Size	Description	(Table 0567)
 00h	WORD	length of structure buffer
 02h	DWORD	-> structure array buffer (see #0568)

Format of Intel Plug-and-Play AUTO-CONFIGURATION ??? structure entry [array]:
Offset	Size	Description	(Table 0568)
 00h	BYTE	???
 01h	BYTE	???
 02h	BYTE	???
 03h	WORD	???
 05h	BYTE	???
 06h	WORD	???
 08h	BYTE	???
 09h	WORD	???
 0Bh	BYTE	???
 0Ch	WORD	???
 0Eh	WORD	???
SeeAlso: #0567
--------X-1AB407-----------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - ???
	AX = B407h
	EDX = length of ???
	EDI = physical address of ???
Return: CF clear if successful
	    AX = 0000h
	    EDI = ???
	CF set on error
	    AX = error code (FFFFh) (see #0551)
Note:	returns error if EDI < 000C0000h
SeeAlso: AX=B400h
--------X-1AB4-------------------------------
INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - 32-BIT API
	AH = B4h
	AL = function (80h-87h)
	further details not yet available
Note:	these functions are 32-bit versions of functions 00h-07h
--------c-1AC0-------------------------------
INT 1A U - Disk Spool II v2.07+ - ALTERNATE INSTALLATION CHECK
	AH = C0h
Return: (see AH=A0h)
Notes:	this call is identical to AH=A0h
	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=A0h,AH=ABh,AH=D0h
--------U-1ACCCCBXCCCC-----------------------
INT 1A U - DATEFIX - INSTALLATION CHECK
	AX = CCCCh
	BX = CCCCh
	CX = 0000h
Return: CX = CCCCh if installed
	    ES:BX -> original interrupt handler
Program: DATEFIX is a public-domain TSR to correct the date on AT&T 6300
	  machines, where the realtime clock's calendar wraps after 1991
SeeAlso: AH=FEh,AH=FFh"AT&T"
--------c-1AD0-------------------------------
INT 1A U - Disk Spool II v2.07+ - FUNCTION CALLS
	AH = D0h
	AL = function code
	    01h enable spooler and despooler
	    02h enable spooler only
	    03h enable despooler at beginning of file
	    04h disable the despooler
	    05h disable the despooler and spooler
	    06h clear the spool file
	    08h inhibit the popup menu
	    09h enable the popup menu
	    0Ah ??? (called by Disk Spool's INT 21 handler)
	    0Bh disable the spooler
	    0Ch start despooler after last successfully printed document
	    0Dh start despooler at the exact point where it last left off
	    0Eh pop up the menu
	    0Fh ???
	    11h start new spool file??? (called by Disk Spool's INT 21 handler
			when a program terminates)
	    14h ???
	    15h delete despool file and reset ???
	    16h ??? (writes something to unknown file)
	    17h ??? (writes something to despool file, then reads something
			else and ???)
	    18h ??? (reads something from despool file, and then ???)
	    19h ??? (creates/truncates spool file)
	    20h clear file pointed to by the despooler
	    21h ??? (writes something to unknown file)
	    22h ??? (writes something to spool file if spooler/despooler using
			same file)
	    23h ??? (opens/creates unknown file, then ???)
	    30h ???
	    31h ???
	    32h beep
	    33h append CRLF to spool file???
	    34h ???
	    35h ???
	    36h ???
	    37h append CRLF to spool file and start a new spool file???
	    38h ???
	    40h ??? (v4.05)
	    41h ??? (v4.05)
	    51h ??? (called by Disk Spool's INT 21 handler)
	    52h ??? (called by Disk Spool's INT 21 handler)
	    57h ???
	    5Ah ??? (v4.05)
	    5Bh ??? (v4.05)
	    5Ch ??? (v4.05)
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=A0h,AH=ADh
--------c-1AE0-------------------------------
INT 1A - Disk Spool II v4.0x - ENABLE/DISABLE
	AH = E0h
	AL = subfunction
	    01h enable spooler
	    02h disable spooler
	    03h enable despooler
	    04h disable despooler
	CL = printer port (01h COM1, 02h COM2, 05h LPT1, 06h LPT2)
Return: AH = status
	    00h successful
	    F0h printer port not managed by Disk Spool II
	    FFH failed
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=A0h,AH=E1h,AX=E301h,AX=E401h
--------c-1AE1-------------------------------
INT 1A - Disk Spool II v4.0x - GET STATUS
	AH = E1h
	CL = printer port (01h COM1, 02h COM2, 05h LPT1, 06h LPT2)
Return: AH = status
	    00h successful
		CL = despooler state (00h disabled, 41h enabled)
		CH = spooler state (00h disabled, 41h enabled)
		DL = despooler activity (00h standing by, 41h printing)
		ES:BX -> ASCIZ name of current spool file (or next if AutoSpool
			or AutoDespool enabled)
		ES:SI -> ASCIZ name of current despool file
		ES:DI -> 3-byte file extension used by Disk Spool II
	    F0h printer port not managed by Disk Spool II
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=A0h,AH=E0h,AH=E2h
----------1AE11B-----------------------------
INT 1A - TheGrab v4.60 - ???
	AX = E11Bh
	???
Return: ??? (may destroy all registers)
SeeAlso: AX=E11Dh
----------1AE11D-----------------------------
INT 1A - TheGrab v4.60 - INSTALLATION CHECK
	AX = E11Dh
Return: ES:DI -> signature block (see #0569) if installed
	    CX = length of signature block (000Fh)
Program: TheGrab is a resident ANSI screen grabber bundled with TheDraw
SeeAlso: AX=E11Bh

Format of TheGrab signature block:
Offset	Size	Description	(Table 0569)
 00h	BYTE	08h
 01h  8 BYTEs	ASCIZ "THEGRAB"
 09h  6 BYTEs	??? (zeros)
--------c-1AE2-------------------------------
INT 1A - Disk Spool II v4.0x - GET SPOOL FILES
	AH = E2h
	AL = which
	    01h first
	    02h next (can only call after "first")
	CL = printer port (01h COM1, 02h COM2, 05h LPT1, 06h LPT2)
Return: AH = status
	    00h successful
		ES:BX -> ASCIZ filename
	    F0h no (more) spool files
	    FFh failed
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=E0h,AH=E1h
--------c-1AE301-----------------------------
INT 1A - Disk Spool II v4.0x - GET SPOOL FILE STATUS
	AX = E301h
	ES:BX -> ASCIZ filename (max 32 chars)
Return: AH = status
	    00h successful
		ES:SI -> spool file status record (see #0570)
	    F0h not a spool file
	    FFh failed
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=E0h,AX=E302h,AX=E401h

Format of Disk Spool II spool file status record:
Offset	Size	Description	(Table 0570)
 00h	BYTE	hour of creation or last update
 01h	BYTE	minute of creation or last update
 02h	BYTE	year-1980 of creation or last update
 03h	BYTE	month of creation or last update
 04h	BYTE	day of creation or last update
 05h	BYTE	total number of copies to print
 06h	BYTE	number of copies already printed
 07h	BYTE	printer port (01h COM1, 02h COM2, 05h LPT1, 06h LPT2)
 08h	BYTE	save status (00h delete after printing, 01h save)
 09h	BYTE	file status
		01h done printing, but being saved
		02h on hold
		03h queued for printing
		04h being spooled
		05h being despooled (i.e. printed)
 0Ah 16 BYTEs	ASCIZ description
 1Ah  2 WORDs	file size in bytes (high,low)
 1Eh  2 WORDs	bytes left to print (high,low)
--------c-1AE302-----------------------------
INT 1A - Disk Spool II v4.0x - UPDATE SPOOL FILE
	AX = E302h
	ES:BX -> ASCIZ filename (max 32 chars)
	ES:SI -> spool file status record (see #0570)
Return: AH = status
	    00h successful
	    F0h not a spool file
	    FFh failed
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=E0h,AX=E301h,AX=E401h
--------c-1AE401-----------------------------
INT 1A - Disk Spool II v4.0x - SPOOL EXISTING FILE
	AX = E401h
	ES:BX -> ASCIZ filename (max 32 chars)
	CL = printer port (01h COM1, 02h COM2, 05h LPT1, 06h LPT2)
Return: AH = status
	    00h successful
	    FFh failed
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=E1h,AX=E302h,AX=E402h
--------c-1AE402-----------------------------
INT 1A U - Disk Spool II v4.0x - SPOOL EXISTING FILE???
	AX = E402h
	ES:BX -> ASCIZ filename (max 32 chars)
	CL = printer port (01h COM1, 02h COM2, 05h LPT1, 06h LPT2)
Return: AH = status
	    00h successful
	    FFh failed
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=E1h,AX=E302h,AX=E401h
--------c-1AE5-------------------------------
INT 1A U - Emulaser ELSPL.COM - ???
	AH = E5h
	???
Return: ???
Program: ELSPL.COM is a licensed version of Disk Spool II which is distributed
	  as part of Vertisoft's Emulaser PostScript emulator
SeeAlso: AH=A0h,INT 17/AH=03h
--------c-1AEE-------------------------------
INT 1A U - Disk Spool II v4.05 - ???
	AH = EEh
	AL = printer port???
	???
Return: ???
Note:	this function is also supported by Vertisoft's Emulaser utility ELSPL,
	  as that is a licensed version of Disk Spool II
SeeAlso: AH=E1h
--------U-1AF7-------------------------------
INT 1A - RighTime v1.1 - TEMPORARILY DISABLE
	AH = F7h
Program: RighTime is a TSR by G.T. Becker which continuously adjusts the system
	  time to correct for clock drift
Note:	any AH value from F0h-F7h or F9h-FEh will perform this function in
	  version 1.1, but F7h is the function called by transient portion
SeeAlso: AH=F8h,AH=FFh"RighTime"
--------U-1AF8-------------------------------
INT 1A - RighTime v1.1 - ENABLE
	AH = F8h
Program: RighTime is a TSR by G.T. Becker which continuously adjusts the system
	  time to correct for clock drift
Note:	RighTime is TeSseRact-compatible (see INT 2F/AX=5453h) and modifies its
	  TeSseRact program identifier based on its current state: "RighTime"
	  when enabled, "RighTim"F7h when disabled.
SeeAlso: AH=F7h,AH=FFh"RighTime"
--------b-1AFE-------------------------------
INT 1A - AT&T 6300 - READ TIME AND DATE
	AH = FEh
Return: BX = day count (0 = Jan 1, 1984)
	CH = hour
	CL = minute
	DH = second
	DL = hundredths
SeeAlso: AX=CCCCh/BX=CCCCh,AH=FFh"AT&T",INT 21/AH=2Ah,INT 21/AH=2Ch
--------b-1AFF-------------------------------
INT 1A - AT&T 6300 - SET TIME AND DATE
	AH = FFh
	BX = day count (0 = Jan 1, 1984)
	CH = hour
	CL = minute
	DH = second
	DL = hundredths
Return: ???
SeeAlso: AX=CCCCh/BX=CCCCh,AH=FEh,INT 21/AH=2Bh,INT 21/AH=2Dh
--------U-1AFF-------------------------------
INT 1A - RighTime v1.1 - PERMANENTLY DISABLE
	AH = FFh
Program: RighTime is a TSR by G.T. Becker which continuously adjusts the system
	  time to correct for clock drift
Note:	upon being permanently disabled, RighTime closes the file handle
	  referencing its executable (which is updated with time correction
	  information every two minutes while RighTime is enabled).
--------s-1AFF00-----------------------------
INT 1A - SND - INSTALLATION CHECK???
	AX = FF00h
Return: AL = version??? (02h)
	AH = busy flag (00h if not in a SND call, 01h if SND currently active)
Note:	the SND API is also supported by IC (Internal Commands) v2.0, a
	  shareware TSR by Geoff Friesen which extends COMMAND.COM's internal
	  command set
SeeAlso: AX=FF01h,AX=FF02h,AX=FF04h,AX=FF05h
--------s-1AFF01-----------------------------
INT 1A - SND - PAUSE
	AX = FF01h
	DX = number of clock ticks to delay
Return: AH = status
	    00h successful
	    01h SND busy
Notes:	if successful, execution returns to the caller after the delay expires;
	  if SND is busy, execution returns immediately
	the IC v2.0 implementation of this API makes no special allowance for
	  time rollover at midnight, which can cause the delay to be over one
	  hour if this function is called just before the BIOS time count
	  rolls over and the delay extends into the next day
SeeAlso: AX=FF00h,INT 15/AH=86h,INT 62/AX=0096h,INT 7F/AH=E8h,INT 80/BX=0009h
SeeAlso: INT E0/CL=BDh
--------s-1AFF02-----------------------------
INT 1A - SND - START SOUND
	AX = FF02h
	DX = frequency in Hertz (14h-FFFFh)
Return: AH = status
	    00h successful
	    01h SND busy
SeeAlso: AX=FF00h,AX=FF01h,AX=FF03h
--------s-1AFF03-----------------------------
INT 1A - SND - STOP SOUND
	AX = FF03h
Return: AH = status
	    00h successful
	    01h busy
Note:	turns off any sound currently being emitted by the PC's speaker unless
	  SND is currently busy processing an API call (this includes
	  background music).  Use AX=FF05h to stop the sound even if an API
	  call is in progress.
SeeAlso: AX=FF00h,AX=FF02h,AX=FF05h
--------s-1AFF04-----------------------------
INT 1A - SND - PLAY MUSIC STRING IN BACKGROUND
	AX = FF04h
	DS:DX -> ASCIZ music string
Return: AH = status
	    00h successful (music begins playing in background)
	    01h busy
Note:	the music string accepted by SND is not the same as that accepted by
	  BASIC and other programs which process music strings
SeeAlso: AX=FF00h,AX=FF05h,INT 80/BX=0006h
--------s-1AFF05-----------------------------
INT 1A - SND - UNCONDITIONALLY STOP SOUND
	AX = FF05h
Return: AH = 00h (successful)
Note:	this function is the same as AX=FF03h, but will stop the sound even if
	  SND is currently busy, such as playing background music
SeeAlso: AX=FF00h,AX=FF03h,INT 80/BX=0007h
--------B-1B---------------------------------
INT 1B C - KEYBOARD - CONTROL-BREAK HANDLER
Desc:	this interrupt is automatically called when INT 09 determines that
	  Control-Break has been pressed
Note:	normally points to a short routine in DOS which sets the Ctrl-C flag,
	  thus invoking INT 23h the next time DOS checks for Ctrl-C.
SeeAlso: INT 23
--------B-1C---------------------------------
INT 1C - TIME - SYSTEM TIMER TICK
Desc:	this interrupt is automatically called on each clock tick by the INT 08
	  handler
Notes:	this is the preferred interrupt to chain when a program needs to be
	  invoked regularly
	not available on NEC 9800-series PCs
SeeAlso: INT 08,INT E2"PC Cluster"
--------B-1D---------------------------------
INT 1D - SYSTEM DATA - VIDEO PARAMETER TABLES
Note:	the default parameter table (see #0571) is located at F000h:F0A4h for
	  100% compatible BIOSes
SeeAlso: INT 10/AH=00h

Format of video parameters:
Offset	Size	Description	(Table 0571)
 00h 16 BYTEs	6845 register values for modes 00h and 01h
 10h 16 BYTEs	6845 register values for modes 02h and 03h
 20h 16 BYTEs	6845 register values for modes 04h and 05h
 30h 16 BYTEs	6845 register values for modes 06h and 07h
 40h	WORD	bytes in video buffer for modes 00h and 01h (0800h)
 42h	WORD	bytes in video buffer for modes 02h and 03h (1000h)
 44h	WORD	bytes in video buffer for modes 04h and 05h (4000h)
 46h	WORD	bytes in video buffer for mode 06h (4000h)
 48h  8 BYTEs	columns on screen for each of modes 00h through 07h
 50h  8 BYTEs	CRT controller mode bytes for each of modes 00h through 07h
Note:	QEMM v7.5 Stealth appears to copy only the first 40h bytes of this
	  table into always-accessible memory
--------B-1E---------------------------------
INT 1E - SYSTEM DATA - DISKETTE PARAMETERS
Note:	the default parameter table (see #0572) is located at F000h:EFC7h for
	  100% compatible BIOSes
SeeAlso: INT 13/AH=0Fh,INT 41,INT 4D/AH=0Ah

Format of diskette parameter table:
Offset	Size	Description	(Table 0572)
 00h	BYTE	first specify byte
		bits 7-4: step rate
		bits 3-0: head unload time (0Fh = 240 ms)
 01h	BYTE	second specify byte
		bits 7-1: head load time (01h = 4 ms)
		bit    0: non-DMA mode (always 0)
 02h	BYTE	delay until motor turned off (in clock ticks)
 03h	BYTE	bytes per sector (00h = 128, 01h = 256, 02h = 512, 03h = 1024)
 04h	BYTE	sectors per track
 05h	BYTE	length of gap between sectors (2Ah for 5.25", 1Bh for 3.5")
 06h	BYTE	data length (ignored if bytes-per-sector field nonzero)
 07h	BYTE	gap length when formatting (50h for 5.25", 6Ch for 3.5")
 08h	BYTE	format filler byte (default F6h)
 09h	BYTE	head settle time in milliseconds
 0Ah	BYTE	motor start time in 1/8 seconds
SeeAlso: #1878 at INT 4D/AH=09h
--------B-1F---------------------------------
INT 1F - SYSTEM DATA - 8x8 GRAPHICS FONT
Desc:	this vector points at 1024 bytes of graphics data, 8 bytes for each
	  character 80h-FFh
Note:	graphics data for characters 00h-7Fh stored at F000h:FA6Eh in 100%
	  compatible BIOSes
SeeAlso: INT 10/AX=5000h,INT 43
--------b-1F12-------------------------------
INT 1F U - C&T "SuperState" BIOS - POWER OFF
	AH = 12h
Return: none
Note:	POWER OFF
--------b-1F17-------------------------------
INT 1F U - C&T "SuperState" BIOS - EXECUTE FAR PROC ROUTINE ON SuperState
	AH = 17h
	ES:DI -> far procedure
Return: all registers except AH,ES,DI
Note:	You can change the BIOS area (F000h:0000h - F000h:FFFFh) only through
	  this function
--------b-1F19-------------------------------
INT 1F U - C&T "SuperState" BIOS - ENABLE AUTO WAKEUP AND SET TIME AND DATE
	AH = 19h
	AL = hour in BCD
	BH = minutes in BCD
	BL = seconds in BCD
	CH = year century in BCD (must be 19h)
	CL = year low in BCD
	DH = month in BCD
	DL = date in BCD
Return: CF clear
--------b-1F1C-------------------------------
INT 1F U - C&T "SuperState" BIOS - SET SUSPEND TIMEOUT
	AH = 1Ch
	BX = sec until suspend starts
Return: None	   
--------b-1F1D-------------------------------
INT 1F U - C&T "SuperState" BIOS - SET SLEEP TIMEOUT
	AH = 1Dh
	BX = sec until sleep starts
Return: None	   
--------J-1F90-------------------------------
INT 1F - NEC PC-9801 - COPY EXTENDED MEMORY
	AH = 90h
	ES:BX -> global descriptor table (see #0375 at INT 15/AH=87h)
	CX = number of bytes to copy
	SI = 0000h
	DI = 0000h
Return: CF clear if successful
	CF set on error
	???
SeeAlso: INT 15/AH=87h
--------b-1FF5--BLFA-------------------------
INT 1F U - C&T "SuperState" BIOS - REQUEST PASSWORD INPUT
	AH = F5h
	BL = FAh
Return: none
Note:	this function will not return until the correct password is entered
SeeAlso: AH=F5h/BL=FDh,AX=F5h/BL=FEh
--------b-1FF5--BLFD-------------------------
INT 1F U - C&T "SuperState" BIOS - ENCRYPT PASSWORD
	AH = F5h
	BL = FDh
	CX:SI = input string
	DX:DI = encrypted string
	BH = length of input string
Return: CF set on error
SeeAlso: AH=F5h/BL=FAh,AX=F5h/BL=FEh
--------b-1FF5--BLFE-------------------------
INT 1F U - C&T "SuperState" BIOS - SET PASSWORD
	AH = F5h
	BL = FEh
	CX:SI -> input string
	BH = length of input string (if BH = 00h, clear password)
Return: CF set on error
Note:	the input string must be encrypted by INT 1Fh/AH=F5h/BL=FDh
SeeAlso: AH=F5h/BL=FDh,AX=F5h/BL=FFh
--------b-1FF5--BLFF-------------------------
INT 1F U - C&T "SuperState" BIOS - GET ENCRYPTED PASSWORD
	AH = F5h
	BL = FFh
	DX:DI = string buffer
Return: CF set on error
	CF clear if successful
	    BH = length of input string (if BH = 00h, password is not valid)
	    DX:DI -> encrypted password string
SeeAlso: AH=F5h/BL=FDh,AX=F5h/BL=FEh
--------b-1FFB-------------------------------
INT 1F U - C&T "SuperState" BIOS - GET/SET CPU SPEED
	AH = FBh
	BL = function 
	    00h get CPU speed
		Return: AL = current CPU speed (00h = fast, 01h = slow)
	    01h set CPU speed
		AL = new CPU speed (00h = fast, 01h = slow)
SeeAlso: AH=FCh/BL=00h
--------b-1FFC--BL00-------------------------
INT 1F U - C&T "SuperState" BIOS - GET ALARM STATUS
	AH = FCh
	BL = 00h
Return: AL = current alarm state (00h = disabled, 01h = enabled)
SeeAlso: AH=FCh/BL=01h,AH=FCh/BL=02h
--------b-1FFC--BL01-------------------------
INT 1F U - C&T "SuperState" BIOS - SET ALARM STATUS
	AH = FCh
	BL = 01h
	AL = new alarm state (00h = disabled, 01h = enabled)
SeeAlso: AH=FCh/BL=00h,AH=FCh/BL=03h
--------b-1FFC--BL02-------------------------
INT 1F U - C&T "SuperState" BIOS - GET ALARM TIME
	AH = FCh
	BL = 02h
Return: CH = hour by BCD
	CL = min by BCD
	DH = sec by BCD
SeeAlso: AH=FCh/BL=00h,AH=FCh/BL=03h,AH=FCh/BL=04h
--------b-1FFC--BL03-------------------------
INT 1F U - C&T "SuperState" BIOS - SET ALARM TIME
	AH = FCh
	BL = 03h
	CH = hour by BCD
	CL = min by BCD
	DH = sec by BCD
Return: CF set on error (incorrect time format or Alarm is not enable) 
SeeAlso: AH=FCh/BL=01h,AH=FCh/BL=02h,AH=FCh/BL=05h
--------b-1FFC--BL04-------------------------
INT 1F U - C&T "SuperState" BIOS - GET ALARM DATE
	AH = FCh
	BL = 04h
Return: CH = year century by BCD
	CL = year low by BCD
	DH = month by BCD
	DL = date by BCD
SeeAlso: AH=FCh/BL=02h,AH=FCh/BL=05h
--------b-1FFC--BL05-------------------------
INT 1F U - C&T "SuperState" BIOS - SET ALARM DATE
	AH = FCh
	BL = 05h
	CH = year century by BCD
	CL = year low by BCD
	DH = month by BCD
	DL = date by BCD
Return: CF set on error (incorrect date format or Alarm is not enable) 
SeeAlso: AH=FCh/BL=03h,AH=FCh/BL=04h
--------b-1FFD--BL00-------------------------
INT 1F U - C&T "SuperState" BIOS - GET AUTO WAKE UP STATUS
	AH = FDh
	BL = 00h
Return: AL = current wake-up state (00h = disabled, 01h = enabled)
SeeAlso: AH=FDh/BL=01h,AH=FDh/BL=02h
--------b-1FFD--BL01-------------------------
INT 1F U - C&T "SuperState" BIOS - SET AUTO WAKE UP STATUS
	AH = FDh
	BL = 01h
	AL = new wake-up state (00h = disabled, 01h = enabled)
SeeAlso: AH=FDh/BL=00h,AH=FDh/BL=03h
--------b-1FFD--BL02-------------------------
INT 1F U - C&T "SuperState" BIOS - GET AUTO WAKE UP TIME
	AH = FDh
	BL = 02h
Return: CH = hour by BCD
	CL = min by BCD
	DH = sec by BCD
SeeAlso: AH=FDh/BL=00h,AH=FDh/BL=03h
--------b-1FFD-------------------------------
INT 1F U - C&T "SuperState" BIOS - SET AUTO WAKE UP TIME
       AH = FDh
       BL = 3h
       CH = hour by BCD
       CL = min by BCD
       DH = sec by BCD
Return: CF set on error (incorrect Time format or Auto Wake up is not enable) 
SeeAlso: AH=FDh/BL=01h,AH=FDh/BL=02h
--------b-1FFD--BL04-------------------------
INT 1F U - C&T "SuperState" BIOS - GET AUTO WAKE UP DATE
	AH = FDh
	BL = 04h
Return: CH = year century in BCD
	CL = year low in BCD
	DH = month in BCD
	DL = date in BCD
SeeAlso: AH=FDh/BL=02h,AH=FDh/BL=05h
--------b-1FFD--BL05-------------------------
INT 1F U - C&T "SuperState" BIOS - SET AUTO WAKE UP DATE
	AH = FDh
	BL = 05h
	CH = year century in BCD
	CL = year low in BCD
	DH = month in BCD
	DL = date in BCD
Return: CF set on error (incorrect date format or Auto Wake up is not enable) 
SeeAlso: AH=FDh/BL=03h,AH=FDh/BL=04h
--------O-20---------------------------------
INT 20 - Minix - SEND/RECEIVE MESSAGE
	AX = process ID of other process
	BX -> message
	CX = operation (1 send, 2 receive, 3 send&receive)
Program: Minix is a Version 7 Unix-compatible operating system by Andrew
	  Tanenbaum
Note:	the message contains the system call number (numbered as in V7
	  Unix(tm)) and the call parameters
--------D-20---------------------------------
INT 20 - DOS 1+ - TERMINATE PROGRAM
	CS = PSP segment
Return: never
Note:	(see INT 21/AH=00h)
SeeAlso: INT 21/AH=00h,INT 21/AH=4Ch
--------G-20---------------------------------
INT 20 - COMTROL HOSTESS i/ISA DEBUGGER - INVOKE FIRMWARE DEBUGGER
	???
Return: ???
SeeAlso: INT 21"COMTROL"
--------G-21---------------------------------
INT 21 - COMTROL HOSTESS i/ISA DEBUGGER - GET SEGMENT FOR CONTROL PROGRAM USE
	???
Return: AX = first segment available for control program use
SeeAlso: INT 20"COMTROL",INT 22"COMTROL"
--------D-2100-------------------------------
INT 21 - DOS 1+ - TERMINATE PROGRAM
	AH = 00h
	CS = PSP segment
Notes:	Microsoft recommends using INT 21/AH=4Ch for DOS 2+
	execution continues at the address stored in INT 22 after DOS performs
	  whatever cleanup it needs to do
	if the PSP is its own parent, the process's memory is not freed; if
	  INT 22 additionally points into the terminating program, the
	  process is effectively NOT terminated
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=26h,AH=31h,AH=4Ch,INT 20,INT 22
--------D-2101-------------------------------
INT 21 - DOS 1+ - READ CHARACTER FROM STANDARD INPUT, WITH ECHO
	AH = 01h
Return: AL = character read
Notes:	^C/^Break are checked, and INT 23 executed if read
	character is echoed to standard output
	standard input is always the keyboard and standard output the screen
	  under DOS 1.x, but they may be redirected under DOS 2+
SeeAlso: AH=06h,AH=07h,AH=08h,AH=0Ah
--------D-2102-------------------------------
INT 21 - DOS 1+ - WRITE CHARACTER TO STANDARD OUTPUT
	AH = 02h
	DL = character to write
Return: AL = last character output (despite the official docs which state
		nothing is returned) (at least DOS 3.3-5.0)
Notes:	^C/^Break are checked, and INT 23 executed if pressed
	standard output is always the screen under DOS 1.x, but may be
	  redirected under DOS 2+
	the last character output will be the character in DL unless DL=09h
	  on entry, in which case AL=20h as tabs are expanded to blanks
SeeAlso: AH=06h,AH=09h
--------D-2103-------------------------------
INT 21 - DOS 1+ - READ CHARACTER FROM STDAUX
	AH = 03h
Return: AL = character read
Notes:	keyboard checked for ^C/^Break, and INT 23 executed if detected
	STDAUX is usually the first serial port
SeeAlso: AH=04h,INT 14/AH=02h,INT E0/CL=03h
--------D-2104-------------------------------
INT 21 - DOS 1+ - WRITE CHARACTER TO STDAUX
	AH = 04h
	DL = character to write
Notes:	keyboard checked for ^C/^Break, and INT 23 executed if detected
	STDAUX is usually the first serial port
	if STDAUX is busy, this function will wait until it becomes free
SeeAlso: AH=03h,INT 14/AH=01h,INT E0/CL=04h
--------D-2105-------------------------------
INT 21 - DOS 1+ - WRITE CHARACTER TO PRINTER
	AH = 05h
	DL = character to print
Notes:	keyboard checked for ^C/^Break, and INT 23 executed if detected
	STDPRN is usually the first parallel port, but may be redirected under
	  DOS 2+
	if the printer is busy, this function will wait
SeeAlso: INT 17/AH=00h
--------D-2106-------------------------------
INT 21 - DOS 1+ - DIRECT CONSOLE OUTPUT
	AH = 06h
	DL = character (except FFh)
Return: AL = character output (despite official docs which state nothing is
		returned) (at least DOS 3.3-5.0)
Notes:	does not check ^C/^Break
	writes to standard output, which is always the screen under DOS 1.x,
	  but may be redirected under DOS 2+
SeeAlso: AH=02h,AH=09h
--------D-2106--DLFF-------------------------
INT 21 - DOS 1+ - DIRECT CONSOLE INPUT
	AH = 06h
	DL = FFh
Return: ZF set if no character available
	    AL = 00h
	ZF clear if character available
	    AL = character read
Notes:	^C/^Break are NOT checked
	if the returned character is 00h, the user pressed a key with an
	  extended keycode, which will be returned by the next call of this
	  function
	this function reads from standard input, which is always the keyboard
	  under DOS 1.x, but may be redirected under DOS 2+
	although the return of AL=00h when no characters are available is not
	  documented, some programs rely on this behavior
SeeAlso: AH=0Bh
--------D-2107-------------------------------
INT 21 - DOS 1+ - DIRECT CHARACTER INPUT, WITHOUT ECHO
	AH = 07h
Return: AL = character read from standard input
Notes:	does not check ^C/^Break
	standard input is always the keyboard under DOS 1.x, but may be
	  redirected under DOS 2+
	if the interim console flag is set (see AX=6301h), partially-formed
	  double-byte characters may be returned
SeeAlso: AH=01h,AH=06h,AH=08h,AH=0Ah
--------D-2108-------------------------------
INT 21 - DOS 1+ - CHARACTER INPUT WITHOUT ECHO
	AH = 08h
Return: AL = character read from standard input
Notes:	^C/^Break are checked, and INT 23 executed if detected
	standard input is always the keyboard under DOS 1.x, but may be
	  redirected under DOS 2+
	if the interim console flag is set (see AX=6301h), partially-formed
	  double-byte characters may be returned
SeeAlso: AH=01h,AH=06h,AH=07h,AH=0Ah,AH=64h
--------D-2109-------------------------------
INT 21 - DOS 1+ - WRITE STRING TO STANDARD OUTPUT
	AH = 09h
	DS:DX -> '$'-terminated string
Return: AL = 24h (the '$' terminating the string, despite official docs which
		state that nothing is returned) (at least DOS 3.3-5.0)
Notes:	^C/^Break are checked, and INT 23 is called if either pressed
	standard output is always the screen under DOS 1.x, but may be
	  redirected under DOS 2+
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=02h,AH=06h"OUTPUT"
--------D-210A-------------------------------
INT 21 - DOS 1+ - BUFFERED INPUT
	AH = 0Ah
	DS:DX -> buffer (see #0573)
Return: buffer filled with user input
Notes:	^C/^Break are checked, and INT 23 is called if either detected
	reads from standard input, which may be redirected under DOS 2+
	if the maximum buffer size (see #0573) is set to 00h, this call returns
	  immediately without reading any input
SeeAlso: AH=0Ch,INT 2F/AX=4810h

Format of DOS input buffer:
Offset	Size	Description	(Table 0573)
 00h	BYTE	maximum characters buffer can hold
 01h	BYTE	(call) number of chars from last input which may be recalled
		(ret) number of characters actually read, excluding CR
 02h  N BYTEs	actual characters read, including the final carriage return
--------K-210A00-----------------------------
INT 21 - WCED v1.6+ - INSTALLATION CHECK
	AX = 0A00h
	DS:DX -> 6-byte buffer whose first two bytes must be 00h
Return: buffer offset 02h-05h filled with "Wced" if installed
Program: WCED is a free command-line editor and history utility by Stuart
	  Russell
SeeAlso: AH=FFh"CED"
--------D-210B-------------------------------
INT 21 - DOS 1+ - GET STDIN STATUS
	AH = 0Bh
Return: AL = status
	    00h if no character available
	    FFh if character is available
Notes:	^C/^Break are checked, and INT 23 is called if either pressed
	standard input is always the keyboard under DOS 1.x, but may be
	  redirected under DOS 2+
	if the interim console flag is set (see AX=6301h), this function
	  returns AL=FFh if a partially-formed double-byte character is
	  available
SeeAlso: AH=06h"INPUT",AX=4406h
--------v-210B56-----------------------------
INT 21 - VIRUS - "Perfume" - INSTALLATION CHECK
	AX = 0B56h
Return: AX = 4952h if resident
SeeAlso: AX=0D20h,INT 12/AX=4350h/BX=4920h,INT 13/AH=F2h
--------D-210C-------------------------------
INT 21 - DOS 1+ - FLUSH BUFFER AND READ STANDARD INPUT
	AH = 0Ch
	AL = STDIN input function to execute after flushing buffer
	other registers as appropriate for the input function
Return: as appropriate for the specified input function
Note:	if AL is not one of 01h,06h,07h,08h, or 0Ah, the buffer is flushed but
	  no input is attempted
SeeAlso: AH=01h,AH=06h"INPUT",AH=07h,AH=08h,AH=0Ah
--------D-210D-------------------------------
INT 21 - DOS 1+ - DISK RESET
	AH = 0Dh
Return: (DOS 6 only) CF clear (earlier versions preserve CF)
Notes:	This function writes all modified disk buffers to disk, but does not
	  update the directory information (that is only done when files are
	  closed or a SYNC call is issued)
SeeAlso: AX=5D01h,INT 13/AH=00h,INT 2F/AX=1120h
--------v-210D20-----------------------------
INT 21 - VIRUS - "Crazy Imp" - INSTALLATION CHECK
	AX = 0D20h
Return: AX = 1971h if resident
SeeAlso: AX=0B56h,AH=30h/DX=ABCDh
--------D-210E-------------------------------
INT 21 - DOS 1+ - SELECT DEFAULT DRIVE
	AH = 0Eh
	DL = new default drive (00h = A:, 01h = B:, etc)
Return: AL = number of potentially valid drive letters
Notes:	under Novell NetWare, the return value is always 32, the number of
	  drives that NetWare supports
	under DOS 3+, the return value is the greatest of 5, the value of
	  LASTDRIVE= in CONFIG.SYS, and the number of drives actually present
	on a DOS 1.x/2.x single-floppy system, AL returns 2 since the floppy
	  may be accessed as either A: or B:
	otherwise, the return value is the highest drive actually present
	DOS 1.x supports a maximum of 16 drives, 2.x a maximum of 63 drives,
	  and 3+ a maximum of 26 drives
SeeAlso: AH=19h,AH=3Bh,AH=DBh
--------v-210E--DLAD-------------------------
INT 21 U - Novell DOS 7 - SDRes v27.03 - INSTALLATION CHECK
	AH = 0Eh
	DL = ADh
Return: AL = BAh if installed
Program: SDRes is the resident portion of the Search&Destroy antiviral by
	  Fifth Generation Systems, as bundled with Novell DOS 7
Note:	SDRes will terminate programs which test for the presence of viruses
	  using interrupt-based installation calls, saying that the program
	  may be infected
SeeAlso: AH=0Eh/DL=AEh,AH=0Eh/DL=AFh,AH=4Ah/BX=00B6h,INT 13/AX=A759h
--------v-210E--DLAE-------------------------
INT 21 U - Novell DOS 7 - SDRes v27.03 - CLEAR ??? FLAG
	AH = 0Eh
	DL = AEh
SeeAlso: AH=0Eh/DL=ADh,AH=0Eh/DL=AFh,INT 13/AX=A759h
--------v-210E--DLAF-------------------------
INT 21 U - Novell DOS 7 - SDRes v27.03 - SET ??? FLAG
	AH = 0Eh
	DL = AFh
SeeAlso: AH=0Eh/DL=ADh,AH=0Eh/DL=AEh,INT 13/AX=A759h
--------D-210F-------------------------------
INT 21 - DOS 1+ - OPEN FILE USING FCB
	AH = 0Fh
	DS:DX -> unopened File Control Block (see #0574)
Return: AL = status
	    00h successful
	    FFh file not found or access denied
Notes:	(DOS 3.1+) file opened for read/write in compatibility mode
	an unopened FCB has the drive, filename, and extension fields filled
	  in and all other bytes cleared
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
	DR-DOS checks password attached with AX=4303h
BUG:	APPEND for DOS 3.3+ corrupts DX if the file is not found
SeeAlso: AH=10h,AH=16h,AH=3Dh,AX=4303h

Format of File Control Block:
Offset	Size	Description	(Table 0574)
 -7	BYTE	extended FCB if FFh
 -6   5 BYTEs	reserved
 -1	BYTE	file attribute if extended FCB
 00h	BYTE	drive number (0 = default, 1 = A, etc)
 01h  8 BYTEs	blank-padded file name
 09h  3 BYTEs	blank-padded file extension
 0Ch	WORD	current block number
 0Eh	WORD	logical record size
 10h	DWORD	file size
 14h	WORD	date of last write (see #0877 at AX=5700h)
 16h	WORD	time of last write (see #0876 at AX=5700h) (DOS 1.1+)
 18h  8 BYTEs	reserved (see #0575,#0576,#0577,#0578,#0579)
 20h	BYTE	record within current block
 21h	DWORD	random access record number (if record size is > 64 bytes, high
		  byte is omitted)
Note:	to use an extended FCB, you must specify the address of the FFh flag at
	  offset -7, rather than the address of the drive number field

Format of FCB reserved field for DOS 1.0:
Offset	Size	Description	(Table 0575)
 16h	WORD	location in directory (if high byte = FFh, low byte is device
		  ID)
 18h	WORD	number of first cluster in file
 1Ah	WORD	current absolute cluster number on disk
 1Ch	WORD	current relative cluster number within file
		(0 = first cluster of file, 1 = second cluster, etc.)
 1Eh	BYTE	dirty flag (00h = not dirty)
 1Fh	BYTE	unused

Format of FCB reserved field for DOS 1.10-1.25:
Offset	Size	Description	(Table 0576)
 18h	BYTE	bit 7: set if logical device
		bit 6: not dirty
		bits 5-0: disk number or logical device ID
 19h	WORD	starting cluster number on disk
 1Bh	WORD	current absolute cluster number on disk
 1Dh	WORD	current relative cluster number within file
 1Fh	BYTE	unused

Format of FCB reserved field for DOS 2.x:
Offset	Size	Description	(Table 0577)
 18h	BYTE	bit 7: set if logical device
		bit 6: set if open???
		bits 5-0: ???
 19h	WORD	starting cluster number on disk
 1Bh	WORD	???
 1Dh	BYTE	???
 1Eh	BYTE	???
 1Fh	BYTE	???

Format of FCB reserved field for DOS 3.x:
Offset	Size	Description	(Table 0578)
 18h	BYTE	number of system file table entry for file
 19h	BYTE	attributes
		bits 7,6: 00 = SHARE.EXE not loaded, disk file
			  01 = SHARE.EXE not loaded, character device
			  10 = SHARE.EXE loaded, remote file
			  11 = SHARE.EXE loaded, local file or device
		bits 5-0: low six bits of device attribute word
---SHARE.EXE loaded, local file---
 1Ah	WORD	starting cluster of file on disk
 1Ch	WORD	(DOS 3.x) offset within SHARE of sharing record
		  (see #0849 at AH=52h)
 1Eh	BYTE	file attribute
 1Fh	BYTE	???
---SHARE.EXE loaded, remote file---
 1Ah	WORD	number of sector containing directory entry
 1Ch	WORD	relative cluster within file of last cluster accessed
 1Eh	BYTE	absolute cluster number of last cluster accessed
 1Fh	BYTE	???
---SHARE.EXE not loaded---
 1Ah	BYTE	(low byte of device attribute word AND 0Ch) OR open mode
 1Bh	WORD	starting cluster of file
 1Dh	WORD	number of sector containing directory entry
 1Fh	BYTE	number of directory entry within sector
Note:	if FCB opened on character device, DWORD at 1Ah is set to the address
	  of the device driver header, then the BYTE at 1Ah is overwritten.

Format of FCB reserved field for DOS 5.0:
Offset	Size	Description	(Table 0579)
 18h	BYTE	number of system file table entry for file
 19h	BYTE	attributes
		bits 7,6: 00 = SHARE.EXE not loaded, disk file
			  01 = SHARE.EXE not loaded, character device
			  10 = SHARE.EXE loaded, remote file
			  11 = SHARE.EXE loaded, local file or device
		bits 5-0: low six bits of device attribute word
---SHARE.EXE loaded, local file---
 1Ah	WORD	starting cluster of file on disk
 1Ch	WORD	unique sequence number of sharing record
 1Eh	BYTE	file attributes
 1Fh	BYTE	unused???
---SHARE.EXE loaded, remote file---
 1Ah	WORD	network handle
 1Ch	DWORD	network ID
---SHARE not loaded, local device---
 1Ah	DWORD	pointer to device driver header
 1Eh  2 BYTEs	unused???
---SHARE not loaded, local file---
 1Ah	BYTE	extra info
		bit 7: read-only attribute from SFT
		bit 6: archive attribute from SFT
		bits 5-0: high bits of sector number
 1Bh	WORD	starting cluster of file
 1Dh	WORD	low word of sector number containing directory entry
 1Fh	BYTE	number of directory entry within sector
--------D-2110-------------------------------
INT 21 - DOS 1+ - CLOSE FILE USING FCB
	AH = 10h
	DS:DX -> File Control Block (see #0574)
Return: AL = status
	    00h successful
	    FFh failed
Notes:	a successful close forces all disk buffers used by the file to be
	  written and the directory entry to be updated
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=0Fh,AH=16h,AH=3Eh
--------D-2111-------------------------------
INT 21 - DOS 1+ - FIND FIRST MATCHING FILE USING FCB
	AH = 11h
	DS:DX -> unopened FCB (see #0574), may contain '?' wildcards
Return: AL = status
	    00h successful
		[DTA] unopened FCB for first matching file
	    FFh no matching filename, or bad FCB
Notes:	the type of the returned FCB depends on whether the input FCB was a
	  normal or an extended FCB
	the data returned in the DTA is actually the drive number (or extended
	  FCB header and drive number) followed by the file's directory entry
	  (see #0580); this format happens to be compatible with an unopened
	  FCB
	for extended FCBs with search attribute 08h, the volume label (if any)
	  will be returned even if the current directory is not the root dir.
	DOS 3+ also allows the '*' wildcard
	the search FCB must not be modified if AH=12h will be used to continue
	  searching; DOS 3.3 has set the following parts of the FCB:
		 0Ch	BYTE	???
		 0Dh	WORD	directory entry number of matching file
		 0Fh	WORD	cluster number of current directory
		 11h  4 BYTEs	???
		 15h	BYTE	drive number (1=A:)
	this function is used by many copy protection schemes to obtain the
	  starting cluster of a file
SeeAlso: AH=12h,AH=1Ah,AH=4Eh,INT 2F/AX=111Bh

Format of DOS directory entry:
Offset	Size	Description	(Table 0580)
 00h  8 BYTEs	blank-padded filename
 08h  3 BYTEs	blank-padded file extension
 0Bh	BYTE	attributes
 0Ch 10 BYTEs	reserved
		used by DR-DOS to store file password
 16h	WORD	time of creation or last update (see #0876 at AX=5700h)
 18h	WORD	date of creation or last update (see #0877 at AX=5700h)
 1Ah	WORD	starting cluster number
 1Ch	DWORD	file size
--------D-2112-------------------------------
INT 21 - DOS 1+ - FIND NEXT MATCHING FILE USING FCB
	AH = 12h
	DS:DX -> unopened FCB (see #0574)
Return: AL = status
	    00h successful
		[DTA] = unopened FCB
	    FFh no more matching filenames
Note:	(see AH=11h)
	assumes that successful FindFirst executed on search FCB before call
SeeAlso: AH=1Ah,AH=4Fh,INT 2F/AX=111Ch
--------D-2113-------------------------------
INT 21 - DOS 1+ - DELETE FILE USING FCB
	AH = 13h
	DS:DX -> unopened FCB (see #0574), filename filled with template for
		deletion ('?' wildcards allowed)
Return: AL = status
	    00h one or more files successfully deleted
	    FFh no matching files or all were read-only or locked
Notes:	DOS 1.25+ deletes everything in the current directory (including
	  subdirectories) and sets the first byte of the name to 00h (entry
	  never used) instead of E5h if called on an extended FCB with
	  filename '???????????' and bits 0-4 of the attribute set (bits 1 and
	  2 for DOS 1.x).  This may have originally been an optimization to
	  minimize directory searching after a mass deletion (DOS 1.25+ stop
	  the directory search upon encountering a never-used entry), but can
	  corrupt the filesystem under DOS 2+ because subdirectories are
	  removed without deleting the files they contain.
	currently-open files should not be deleted
	MS-DOS allows deletion of read-only files with an extended FCB, whereas
	  Novell NetWare, DR-DOS 6, and Novell DOS 7 do not
SeeAlso: AH=41h,INT 2F/AX=1113h
--------D-2114-------------------------------
INT 21 - DOS 1+ - SEQUENTIAL READ FROM FCB FILE
	AH = 14h
	DS:DX -> opened FCB (see #0574)
Return: AL = status
	    00h successful
	    01h end of file (no data)
	    02h segment wrap in DTA
	    03h end of file, partial record read
	[DTA] = record read from file
Notes:	reads a record of the size specified in the FCB beginning at the
	  current file position, then updates the current block and current
	  record fields in the FCB
	if a partial record was read, it is zero-padded to the full size
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=0Fh,AH=15h,AH=1Ah,AH=3Fh,INT 2F/AX=1108h
--------D-2115-------------------------------
INT 21 - DOS 1+ - SEQUENTIAL WRITE TO FCB FILE
	AH = 15h
	DS:DX -> opened FCB (see #0574)
	[DTA] = record to write
Return: AL = status
	    00h successful
	    01h disk full
	    02h segment wrap in DTA
Notes:	writes a record of the size specified in the FCB beginning at the
	  current file position, then updates the current block and current
	  record fields in the FCB
	if less than a full sector is written, the data is placed in a DOS
	  buffer to be written out at a later time
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=0Fh,AH=14h,AH=1Ah,AH=40h,INT 2F/AX=1109h
--------D-2116-------------------------------
INT 21 - DOS 1+ - CREATE OR TRUNCATE FILE USING FCB
	AH = 16h
	DS:DX -> unopened FCB (see #0574), wildcards not allowed
Return: AL = status
	    00h successful
	    FFh directory full or file exists and is read-only or locked
Notes:	if file already exists, it is truncated to zero length
	if an extended FCB is used, the file is given the attribute in the
	  FCB; this is how to create a volume label in the disk's root dir
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=0Fh,AH=10h,AH=3Ch
--------D-2117-------------------------------
INT 21 - DOS 1+ - RENAME FILE USING FCB
	AH = 17h
	DS:DX -> modified FCB (see also #0574)
		the old filename ('?' wildcards OK) is in the standard location
		while the new filename ('?' wildcards OK) is stored in the 11
		bytes beginning at offset 11h
Return: AL = status
	    00h successfully renamed
	    FFh no matching files,file is read-only, or new name already exists
Notes:	subdirectories may be renamed using an extended FCB with the
	  appropriate attribute, as may volume labels
	DR-DOS checks password attached with AX=4303h before permitting rename
SeeAlso: AH=0Fh,AH=13h,AX=4303h,AH=56h,INT 2F/AX=1111h
--------D-2118-------------------------------
INT 21 - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
	AH = 18h
Return: AL = 00h
Note:	corresponds to the CP/M BDOS function "get bit map of logged drives",
	  which is meaningless under MS-DOS
SeeAlso: AH=1Dh,AH=1Eh,AH=20h,AX=4459h,INT 60/DI=0513h
--------D-2119-------------------------------
INT 21 - DOS 1+ - GET CURRENT DEFAULT DRIVE
	AH = 19h
Return: AL = drive (00h = A:, 01h = B:, etc)
Note:	Novell NetWare uses the fact that DOS 2.x COMMAND.COM issues this call
	  from a particular location every time it starts a command to
	  determine when to issue an automatic EOJ
SeeAlso: AH=0Eh,AH=47h,AH=BBh
--------D-211A-------------------------------
INT 21 - DOS 1+ - SET DISK TRANSFER AREA ADDRESS
	AH = 1Ah
	DS:DX -> Disk Transfer Area (DTA)
Notes:	the DTA is set to PSP:0080h when a program is started
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=11h,AH=12h,AH=2Fh,AH=4Eh,AH=4Fh
--------D-211B-------------------------------
INT 21 - DOS 1+ - GET ALLOCATION INFORMATION FOR DEFAULT DRIVE
	AH = 1Bh
Return: AL = sectors per cluster (allocation unit)
	CX = bytes per sector
	DX = total number of clusters
	DS:BX -> media ID byte (see #0581)
Note:	under DOS 1.x, DS:BX points at an actual copy of the FAT; later
	  versions return a pointer to a copy of the FAT's ID byte
SeeAlso: AH=1Ch,AH=36h

(Table 0581)
Values for media ID byte:
 FFh	floppy, double-sided, 8 sectors per track (320K)
 FEh	floppy, single-sided, 8 sectors per track (160K)
 FDh	floppy, double-sided, 9 sectors per track (360K)
 FCh	floppy, single-sided, 9 sectors per track (180K)
 FAh	HP 200LX D: ROM disk, 16 sectors per track (995K)
	HP 200LX E: (Stacker host drive ???)
 F9h	floppy, double-sided, 15 sectors per track (1.2M)
	floppy, double-sided, 9 sectors per track (720K,3.5")
 F8h	hard disk
 F0h	other media
	(e.g. floppy, double-sized, 18 sectors per track -- 1.44M,3.5")
--------D-211C-------------------------------
INT 21 - DOS 1+ - GET ALLOCATION INFORMATION FOR SPECIFIC DRIVE
	AH = 1Ch
	DL = drive (00h = default, 01h = A:, etc)
Return: AL = sectors per cluster (allocation unit), or FFh if invalid drive
	CX = bytes per sector
	DX = total number of clusters
	DS:BX -> media ID byte (see #0581)
Notes:	under DOS 1.x, DS:BX points at an actual copy of the FAT; later
	  versions return a pointer to a copy of the FAT's ID byte
	on a DBLSPACE drive, the total number of clusters is based on the
	  estimated compression ratio
SeeAlso: AH=1Bh,AH=36h
--------D-211D-------------------------------
INT 21 - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
	AH = 1Dh
Return: AL = 00h
Note:	corresponds to the CP/M BDOS function "get bit map of read-only
	  drives", which is meaningless under MS-DOS
SeeAlso: AH=18h,AH=1Eh,AH=20h,AX=4459h
--------D-211E-------------------------------
INT 21 - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
	AH = 1Eh
Return: AL = 00h
Note:	corresponds to the CP/M BDOS function "set file attributes" which was
	 meaningless under MS-DOS 1.x
SeeAlso: AH=18h,AH=1Dh,AH=20h
--------D-211F-------------------------------
INT 21 - DOS 1+ - GET DRIVE PARAMETER BLOCK FOR DEFAULT DRIVE
	AH = 1Fh
Return: AL = status
	    00h successful
		DS:BX -> Drive Parameter Block (DPB) (see #0582 for DOS 1.x,
			AH=32h for DOS 2+)
	    FFh invalid drive
Note:	this call was undocumented prior to the release of DOS 5.0; however,
	  only the DOS 4+ version of the DPB has been documented
SeeAlso: AH=32h

Format of DOS 1.1 and MS-DOS 1.25 drive parameter block:
Offset	Size	Description	(Table 0582)
 00h	BYTE	sequential device ID
 01h	BYTE	logical drive number (0=A:)
 02h	WORD	bytes per sector
 04h	BYTE	highest sector number within a cluster
 05h	BYTE	shift count to convert clusters into sectors
 06h	WORD	starting sector number of first FAT
 08h	BYTE	number of copies of FAT
 09h	WORD	number of directory entries
 0Bh	WORD	number of first data sector
 0Dh	WORD	highest cluster number (number of data clusters + 1)
 0Fh	BYTE	sectors per FAT
 10h	WORD	starting sector of directory
 12h	WORD	address of allocation table
Note:	the DOS 1.0 table is the same except that the first and last fields
	  are missing; see INT 21/AH=32h for the DOS 2+ version
--------D-2120-------------------------------
INT 21 - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
	AH = 20h
Return: AL = 00h
Note:	corresponds to the CP/M BDOS function "get/set default user
	  (sublibrary) number", which is meaningless under MS-DOS
SeeAlso: AH=18h,AH=1Dh,AH=1Eh,AX=4459h
--------D-2121-------------------------------
INT 21 - DOS 1+ - READ RANDOM RECORD FROM FCB FILE
	AH = 21h
	DS:DX -> opened FCB (see #0574)
Return: AL = status
	    00h successful
	    01h end of file, no data read
	    02h segment wrap in DTA, no data read
	    03h end of file, partial record read
	[DTA] = record read from file
Notes:	the record is read from the current file position as specified by the
	  random record and record size fields of the FCB
	the file position is not updated after reading the record
	if a partial record is read, it is zero-padded to the full size
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=14h,AH=22h,AH=27h,AH=3Fh
--------D-2122-------------------------------
INT 21 - DOS 1+ - WRITE RANDOM RECORD TO FCB FILE
	AH = 22h
	DS:DX -> opened FCB (see #0574)
	[DTA] = record to write
Return: AL = status
	    00h successful
	    01h disk full
	    02h segment wrap in DTA
Notes:	the record is written to the current file position as specified by the
	  random record and record size fields of the FCB
	the file position is not updated after writing the record
	if the record is located beyond the end of the file, the file is
	  extended but the intervening data remains uninitialized
	if the record only partially fills a disk sector, it is copied to a
	  DOS disk buffer to be written out to disk at a later time
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=15h,AH=21h,AH=28h,AH=40h
--------D-2123-------------------------------
INT 21 - DOS 1+ - GET FILE SIZE FOR FCB
	AH = 23h
	DS:DX -> unopened FCB (see #0574), wildcards not allowed
Return: AL = status
	    00h successful (matching file found)
		FCB random record field filled with size in records, rounded up
		to next full record
	    FFh failed (no matching file found)
Notes:	not supported by MS Windows 3.0 DOSX.EXE DOS extender
	MS-DOS returns nonsense if the FCB record number field is set to a very
	  large positive number, and status FFh if negative; DR-DOS returns the
	  correct file size in both cases
BUG:	APPEND for DOS 3.3+ corrupts DX if the file is not found
SeeAlso: AH=42h
--------D-2124-------------------------------
INT 21 - DOS 1+ - SET RANDOM RECORD NUMBER FOR FCB
	AH = 24h
	DS:DX -> opened FCB (see #0574)
Notes:	computes the random record number corresponding to the current record
	  number and record size, then stores the result in the FCB
	normally used when switching from sequential to random access
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=21h,AH=27h,AH=42h
--------D-2125-------------------------------
INT 21 - DOS 1+ - SET INTERRUPT VECTOR
	AH = 25h
	AL = interrupt number
	DS:DX -> new interrupt handler
Notes:	this function is preferred over direct modification of the interrupt
	  vector table
	some DOS extenders place an API on this function, as it is not
	  directly meaningful in protected mode
	under DR-DOS 5.0+, this function does not use any of the DOS-internal
	  stacks and may thus be called at any time
	Novell NetWare (except the new DOS Requester) monitors the offset of
	  any INT 24 set, and if equal to the value at startup, substitutes
	  its own handler to allow handling of network errors; this introduces
	  the potential bug that any program whose INT 24 handler offset
	  happens to be the same as COMMAND.COM's will not have its INT 24
	  handler installed
SeeAlso: AX=2501h,AH=35h
--------E-212501-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - RESET DOS EXTENDER DATA STRUCTURES
	AX = 2501h
	SS = application's original SS or DS (FlashTek X-32VM)
Return: CF clear if successful
	CF set on error
	    caller is operating on X-32 stack (FlashTek X-32VM)
Notes:	Phar Lap uses INT 21/AH=25h as the entry point for all 386/DOS-Extender
	  system calls.	 Only available when directly using 386/DOS-Extender or
	  a compatible DOS extender, or when using a product that was created
	  using 386-DOS/Extender or a compatible
	this function is also supported by FlashTek X-32VM
SeeAlso: AH=30h"Phar Lap"
--------E-212502-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET PROTECTED-MODE INTERRUPT VECTOR
	AX = 2502h
	CL = interrupt number
Return: CF clear
	ES:EBX = CS:EIP of protected-mode interrupt handler
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2503h,AX=2504h,INT 31/AX=0204h
--------E-212503-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET REAL-MODE INTERRUPT VECTOR
	AX = 2503h
	CL = interrupt number
Return: CF clear
	EBX = CS:IP of real-mode interrupt handler
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2502h,AX=2504h,AH=35h,INT 31/AX=0200h
--------E-212504-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - SET PROTECTED-MODE INTERRUPT VECTOR
	AX = 2504h
	CL = interrupt number
	DS:EDX = CS:EIP of protected-mode interrupt handler
Return: CF clear
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2502h,AX=2505h,INT 31/AX=0205h
--------E-212505-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - SET REAL-MODE INTERRUPT VECTOR
	AX = 2505h
	CL = interrupt number
	EBX = CS:IP of real-mode interrupt handler
Return: CF clear
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2503h,AX=2504h,INT 31/AX=0201h
--------E-212506-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - SET INT TO ALWAYS GAIN CNTRL IN PR. MODE
	AX = 2506h
	CL = interrupt number
	DS:EDX = CS:EIP of protected-mode interrupt handler
Return: CF clear
Notes:	this function modifies both the real-mode low-memory interrupt
	  vector table and the protected-mode Interrupt Descriptor Table (IDT)
	interrupts occurring in real mode are resignaled in protected mode
	this function is also supported by FlashTek X-32VM
--------E-212507-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - SET REAL- & PROTECTED-MODE INT VECTORS
	AX = 2507h
	CL = interrupt number
	DS:EDX = CS:EIP of protected-mode interrupt handler
	EBX = CS:IP of real-mode interrupt handler
Return: CF clear
Notes:	interrupts are disabled until both vectors have been modified
	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2504h,AX=2505h
--------E-212508-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET SEGMENT LINEAR BASE ADDRESS
	AX = 2508h
	BX = segment selector
Return: CF clear if successful
	    ECX = linear base address of segment
	CF set if invalid segment selector
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2509h
--------E-212509-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - CONVERT LINEAR TO PHYSICAL ADDRESS
	AX = 2509h
	EBX = linear address to convert
Return: CF clear if successful
	    ECX = physical address (carry flag clear)
	CF set if linear address not mapped in page tables
SeeAlso: AX=2508h
--------E-212509-----------------------------
INT 21 P - FlashTek X-32VM - GET SYSTEM SEGMENTS AND SELECTORS
	AX = 2509h
Return: CF clear
	EAX high word = default DS
	AX = alias for 16-bit data segment
	BX = real mode code segment
	EDX high word = selector covering full 4GB address space
	DX = default SS
	ESI high word = PSP selector
	SI = environment selector
--------E-21250A-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - MAP PHYSICAL MEMORY AT END OF SEGMENT
	AX = 250Ah
	ES = segment selector in the Local Descriptor Table (LDT) of segment
	     to modify
	EBX = physical base address of memory to map (multiple of 4K)
	ECX = number of physical 4K pages to map
Return: CF clear if successful
	    EAX = 32-bit offset in segment of mapped memory
	CF set on error
	    EAX = error code
		08h insufficient memory to create page tables
		09h invalid segment selector
SeeAlso: INT 31/AX=0800h
--------E-21250C-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET HARDWARE INTERRUPT VECTORS
	AX = 250Ch
Return: CF clear
	AL = base interrupt vector for IRQ0-IRQ7
	AH = base interrupt vector for IRQ8-IRQ15
	BL = interrupt vector for BIOS print screen function (Phar Lap only)
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: INT 31/AX=0400h,INT 67/AX=DE0Ah
--------E-21250D-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET REAL-MODE LINK INFORMATION
	AX = 250Dh
Return: CF clear
	EAX = CS:IP of real-mode callback procedure (see #0583) that will
		  call through from real mode to a protected-mode routine
	EBX = 32-bit real-mode address of intermode call data buffer
	ECX = size in bytes of intermode call data buffer
	ES:EDX = protected-mode address of intermode call data buffer
Notes:	this function is also supported by FlashTek X-32VM
	X-32VM guarantees the intermode buffer to be at least 4 KB
SeeAlso: AX=250Eh

(Table 0583)
Call Phar Lap real-mode callback with:
	STACK:	DWORD	offset to protected-mode code
		WORD	placeholder for protected-mode CS
		DWORD	pointer to selector structure (see #0584)
			or 0000h:0000h for defaults
		var	parameters for protected-mode procedure
Return: via FAR return

Format of Phar Lap selector structure:
Offset	Size	Description	(Table 0584)
 00h	WORD	protected-mode GS selector
 02h	WORD	protected-mode FS selector
 04h	WORD	protected-mode ES selector
 06h	WORD	protected-mode DS selector
--------E-21250E-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE
	AX = 250Eh
	EBX = CS:IP of real-mode procedure to call
	ECX = number of two-byte words to copy from protected-mode stack
	      to real-mode stack
Return: CF clear if successful
	    all segment registers unchanged
	    all general registers contain values set by real-mode procedure
	    all other flags set as they were left by real-mode procedure
	    stack unchanged
	CF set on error
	    EAX = error code
		01h not enough real-mode stack space
Note:	this function is also supported by FlashTek X-32VM; under X-32VM, the
	  call will fail if ECX > 0000003Fh
SeeAlso: AX=250Dh,AX=2510h,AH=E1h"OS/286",INT 31/AX=0301h
--------E-21250F-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - CONVERT PROTECTED-MODE ADDRESS TO MS-DOS
	AX = 250Fh
	ES:EBX = 48-bit protected-mode address to convert
	ECX = 00000000h or length of data in bytes
Return: CF clear if successful (address < 1MB and contiguous)
	    ECX = 32-bit real-mode MS-DOS address
	CF set on error (address >= 1MB or not contiguous)
	    ECX = linear address
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2510h
--------E-212510-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE, REGISTERS
	AX = 2510h
	EBX = CS:IP of real-mode procedure to call
	ECX = number of two-byte words to copy to protected-mode stack to
	      real-mode stack
	DS:EDX -> pointer to parameter block (see #0585)
Return: CF clear if successful
	    all segment registers unchanged,
	    EDX unchanged
	    all other general registers contain values set by real-mode proc
	    all other flags are set as they were left by real-mode procedure
	    real-mode register values are returned in the parameter block
	CF set on error
	    EAX = error code
		01h not enough real-mode stack space
Note:	unlike most of the preceding 25xxh functions, this one is not
	  supported by FlashTek X-32VM
SeeAlso: AX=250Eh,AX=250Fh

Format of Phar Lap real-mode call parameter block:
Offset	Size	Description	(Table 0585)
 00h	WORD	real-mode DS value
 02h	WORD	real-mode ES value
 04h	WORD	real-mode FS value
 06h	WORD	real-mode GS value
 08h	DWORD	real-mode EAX value
 0Ch	DWORD	real-mode EBX value
 10h	DWORD	real-mode ECX value
 14h	DWORD	real-mode EDX value
--------E-212511-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - ISSUE REAL-MODE INTERRUPT
	AX = 2511h
	DS:EDX -> parameter block (see #0586)
Return: all segment registers unchanged
	EDX unchanged
	all other registers contain values set by the real-mode int handler
	the flags are set as they were left by the real-mode interrupt handler
	real-mode register values are returned in the parameter block
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: AX=2503h,AX=2505h,AX=250Eh,AH=E3h"OS/286",INT 31/AX=0300h

Format of Phar Lap real-mode interrupt parameter block:
Offset	Size	Description	(Table 0586)
 00h	WORD	interrupt number
 02h	WORD	real-mode DS value
 04h	WORD	real-mode ES value
 06h	WORD	real-mode FS value
 08h	WORD	real-mode GS value
 0Ah	DWORD	real-mode EAX value
 0Eh	DWORD	real-mode EDX value
Note: all other real-mode values set from protected-mode registers
--------E-212512-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - LOAD PROGRAM FOR DEBUGGING
	AX = 2512h
	DS:EDX -> pointer to ASCIZ program name
	ES:EBX -> pointer to parameter block (see #0588)
	ECX = size in bytes of LDT buffer
Return: CF clear if successful
	    EAX = number of segment descriptors in LDT
	CF set on error
	    EAX = error code (see #0587)
SeeAlso: AX=2517h

(Table 0587)
Values for Phar Lap error code:
 02h	file not found or path invalid
 05h	access denied
 08h	insufficient memory
 0Ah	environment invalid
 0Bh	invalid file format
 80h	LDT too small

Format of Phar Lap program load parameter block:
Offset	Size	Description	(Table 0588)
Input:
 00h	DWORD	32-bit offset of environment string
 04h	WORD	segment of environment string
 06h	DWORD	32-bit offset of command-tail string
 0Ah	WORD	segment of command-tail string
 0Ch	DWORD	32-bit offset of LDT buffer (size in ECX)
 10h	WORD	segment of LDT buffer
Output:
 12h	WORD	real-mode paragraph address of PSP (see also AH=26h)
 14h	WORD	real/protected mode flag
		0000h  real mode
		0001h  protected mode
 16h	DWORD	initial EIP value
 1Ah	WORD	initial CS value
 1Ch	DWORD	initial ESP value
 20h	WORD	initial SS value
 22h	WORD	initial DS value
 24h	WORD	initial ES value
 26h	WORD	initial FS value
 28h	WORD	initial GS value
--------E-212513-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - ALIAS SEGMENT DESCRIPTOR
	AX = 2513h
	BX = segment selector of descriptor in GDT or LDT
	CL = access-rights byte for alias descriptor
	CH = use-type bit (USE16 or USE32) for alias descriptor
Return: CF clear if successful
	    AX = segment selector for created alias
	CF set on error
	    EAX = error code
		08h insufficient memory (can't grow LDT)
		09h invalid segment selector in BX
--------E-212514-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - CHANGE SEGMENT ATTRIBUTES
	AX = 2514h
	BX = segment selector of descriptor in GDT or LDT
	CL = new access-rights byte
	CH = new use-type bit (USE16 or USE32)
Return: CF clear if successful
	CF set on error
	    EAX = error code
		09h invalid selector in BX
SeeAlso: AX=2515h,INT 31/AX=0009h
--------E-212515-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET SEGMENT ATTRIBUTES
	AX = 2515h
	BX = segment selector of descriptor in GDT or LDT
Return: CF clear if successful
	    CL = access-rights byte for segment
	    CH = use-type bit (USE16 or USE32)
	ECX<16-31> destroyed
	CF set on error
	    EAX = error code
		09h invalid segment selector in BX
SeeAlso: AX=2514h
--------E-212516-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender v2.2+ - FREE ALL MEMORY OWNED BY LDT
	AX = 2516h
Return: CF clear
Note:	this function must be called from Ring 0 or the CS descriptor is freed
--------E-212517-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender v2.1c+ - GET INFO ON DOS DATA BUFFER
	AX = 2517h
Return: CF clear
	ES:EBX -> data buffer (protected mode address)
	ECX -> data buffer (real mode address)
	EDX = size of data buffer in bytes
Note:	the data buffer's address changes after calls to AX=2512h and AX=252Ah
SeeAlso: AX=2512h,AX=252Ah,AX=2530h
--------E-212518-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender 2.1c+ - SPECIFY HANDLER FOR MOVED SEGMENTS
	AX = 2518h
	ES:EBX -> function to call when a segment is moved
Return: CF clear
	ES:EBX -> previous handler
--------E-212519-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - GET ADDITIONAL MEMORY ERROR INFO
	AX = 2519h
Return: CF clear
	EAX = error code
	    0000h  no error
	    0001h  out of physical memory
	    0002h  out of swap space (unable to grow swap file)
	    0003h  out of LDT entries and unable to grow LDT
	    0004h  unable to change extended memory allocation mark
	    FFFFFFFFh	paging disabled
Note:	VMM is the Virtual Memory Manager option
--------E-21251A-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - LOCK PAGES IN MEMORY
	AX = 251Ah
	EDX = number of 4k pages to lock
	if BL = 00h
	    ECX = linear address of first page to lock
	if BL = 01h
	    ES:ECX -> pointer to first page to lock
Return: CF clear if successful
	CF set on error
	    EAX = error code
		08h insufficient memory
		09h invalid address range
SeeAlso: AX=251Bh,AX=EB06h,INT 31/AX=0600h
--------E-21251B-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - UNLOCK PAGES
	AX = 251Bh
	EDX = number of pages to unlock
	if BL = 00h
	    ECX = linear address of first page to unlock
	if BL = 01h
	    ES:ECX -> pointer to first page to unlock
Return: CF clear if successful
	CF set on error
	    EAX = error code
		09h invalid address range
SeeAlso: AX=251Ah,AX=EB07h,INT 31/AX=0601h
--------E-21251C-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM v2.1c+ - FREE PHYSICAL MEMORY PAGES
	AX = 251Ch
	BH = preservation flag (00h preserve contents, 01h discard contents)
	EDX = number of pages to free
	BL = address type
	    00h linear address
		ECX = linear address of first page to be freed
	    01h pointer
		ES:ECX -> first page to be freed
Return: CF clear if successful
	CF set on error
	    EAX = error code
		08h memory error, swap space full, no VMM or DPMI
		09h invalid address
--------E-21251D-----------------------------
INT 21 OP - Phar Lap 386/DOS-Extender VMM v2.1c - READ PAGE-TABLE ENTRY
	AX = 251Dh
	BL = address type
	    00h linear address
		ECX = linear address of page table entry to read
	    01h pointer
		ES:ECX -> page table entry to read
Return: CF clear if successful
	    EAX = contents of page table entry
	CF set on error
	    EAX = error code
		09h invalid address or NOPAGE option set
		78h invalid under DPMI
Note:	this function is obsolete; use AX=252Bh/BH=09h instead
SeeAlso: AX=251Eh,AX=252Bh/BH=09h,AX=EB00h,INT 31/AX=0506h
--------E-21251E-----------------------------
INT 21 OP - Phar Lap 386/DOS-Extender VMM v2.1c - WRITE PAGE-TABLE ENTRY
	AX = 251Eh
	BL = address type
	    00h linear address
		ECX = linear address of page table entry to read
	    01h pointer
		ES:ECX -> page table entry to read
	EDX = new value for page table entry
Return: CF clear if successful
	CF set on error
	    EAX = error code
		09h invalid address or NOPAGE option set
		82h not compatible with DPMI
Note:	this call is obsolete; use AX=252Bh/BH=0Ah instead
SeeAlso: AX=251Dh,AX=252Bh/BH=0Ah,INT 31/AX=0507h
--------E-21251F-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - EXHANGE TWO PAGE-TABLE ENTRIES
	AX = 251Fh
	BL = address type
	    00h linear address
		ECX = linear address of first page table entry
		EDX = linear address of second page table entry
	    01h pointer
		ES:ECX -> first page table entry
		ES:EDX -> second page table entry
Return: CF clear if successful
	CF set on error
	    EAX = error code
		09h invalid address or NOPAGE option set
		82h not compatible with DPMI
SeeAlso: AX=251Dh,AX=251Eh
--------E-212520-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - GET MEMORY STATISTICS
	AX = 2520h
	DS:EDX -> pointer to buffer at least 100 bytes in size (see #0589)
	BL = 0 (don't reset VM stats), 1 (reset VM stats)
Return: carry flag clear

Format of Phar Lap VM statistics buffer:
Offset	Size	Description	(Table 0589)
 00h	DWORD	VM status
		0001h VM subsystem is present
		0000h VM not present
 04h	DWORD	"nconvpg" number of conventional memory pages available
 08h	DWORD	"nbimpg" number of Compaq built-in memory pages available
 0Ch	DWORD	"nextpg" total number of extended memory pages
 10h	DWORD	"extlim" extender memory pages limit
 14h	DWORD	"aphyspg" number of physical memory pages allocated to appl
 18h	DWORD	"alockpg" number of locked pages owned by application
 1Ch	DWORD	"sysphyspg" number physical memory pages allocated to system
 20h	DWORD	"nfreepg" number of free physical pages; approx if EMS VCPI
 24h	DWORD	linear address of beginning of application address space
 28h	DWORD	linear address of end of application address space
 2Ch	DWORD	number of seconds since last time VM stats were reset
 30h	DWORD	number of page faults since last time
 34h	DWORD	number of pages written to swap file since last time
 38h	DWORD	number of reclaimed pages (page faults on swapped pages)
 3Ch	DWORD	number of virtual pages allocated to the application
 40h	DWORD	size in pages of swap file
 44h	DWORD	number of system pages allocated with EMS calls
 48h	DWORD	minimum number of conventional memory pages
 4Ch	DWORD	maximum size in pages to which swap file can be increased
 50h	DWORD	"vmflags"
		bit 0 = 1 if page fault in progress
---v4.0+ ---
 54h	DWORD	number of physical pages guaranteed to be free
 58h	DWORD	number of free physical pages currently available
 5Ch	DWORD	size in pages of largest free block of memory (including disk
		  swap space)
 60h	DWORD	reserved
--------E-212521-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - LIMIT PROGRAM'S EXTENDED MEM USAGE
	AX = 2521h
	EBX = max 4k pages of physical extended memory which program may use
Return: CF clear if successful
	   EBX = maximum limit in pages
	   ECX = minimum limit in pages
	CF set on error
	    EAX = error code
		08h insufficient memory or -nopage switch used
SeeAlso: AX=2522h
--------E-212522-----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v2.2+ - SPECIFY ALTERNATE PAGE-FAULT HANDLR
	AX = 2522h
	ES:EBX -> alternate handler for page faults
Return: CF clear
	ES:EBX -> previous page-fault handler
SeeAlso: AX=2523h
--------E-212523-----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v2.2+ - SPECIFY OUT-OF-SWAP-SPACE HANDLER
	AX = 2523h
	???
Return: ???
Note:	this function takes a DWORD pointer and a DWORD pointer to a DWORD
	  pointer as arguments
SeeAlso: AX=2522h
--------E-212524-----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v2.2+ - INSTALL PAGE-REPLACEMENT HANDLERS
	AX = 2524h
	???
Return: ???
Note:	this function takes three DWORD pointers and three DWORD pointers to
	  DWORD pointers as arguments
--------E-212525-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - LIMIT PROGRAM'S CONVENT'L MEM USAGE
	AX = 2525h
	EBX = limit in 4k pages of physical conventional memory which program
	      may use
Return: CF clear if successful
	    EBX = maximum limit in pages
	    ECX = minimum limit in pages
	CF set on error
	    EAX = error code
		08h insufficient memory or -nopage switch used
SeeAlso: AX=2521h
--------E-212526-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET CONFIGURATION INFORMATION
	AX = 2526h
	???
Return: ???
Notes:	details are not yet available
	this function takes a pointer to the configuration buffer (see #0590)
	  and a poitner to a BYTE as arguments

Format of Phar Lap configuration buffer:
Offset	Size	Description	(Table 0590)
 00h	DWORD	flags 1 (see #0591)
 04h	DWORD	flags 2 (unused through v5.0)
 08h	DWORD	flags 3 (unused through v5.0)
 0Ch	DWORD	386|DOS-Extender major version
 10h	DWORD	386|DOS-Extender minor version
 14h	DWORD	first letter of text after minor version number in version str
 18h	DWORD	beta flag (00h normal release, 01h beta release)
 1Ch	DWORD	processor (3 = 386, 4 = 486)
 20h	DWORD	coprocessor (4 = none, 6 = 287, 7 = 387/486)
 24h	DWORD	Weitek coprocessor flag (0 = none, 1 = present)
 28h	DWORD	machine type (0 = IBM PC compatible, 1 = NEC 9800 series)
 2Ch	DWORD	machine class
		IBM: bus type (0=ISA, 1=MCA, 2=XT, 3=EISA)
		NEC: 0=normal mode, 1=high-res mode
 30h	DWORD	VCPI flag (0 = none, 1 = present)
 34h	DWORD	-WEITEK/-1167 switch (0 = AUTO, 1 = ON, 2 = OFF)
 38h	DWORD	-MINREAL setting
 3Ch	DWORD	-MAXREAL setting
 40h	DWORD	-MINIBUF setting
 44h	DWORD	-MAXIBUF setting
 48h	DWORD	size in bytes of DOS call data buffer
 4Ch	DWORD	number of interrupt stacks (-NISTACK)
 50h	DWORD	interrupt stack size (-ISTKSIZE)
 54h	DWORD	-REALBREAK setting
 58h	DWORD	-CALLBUFS
 5Ch	DWORD	-HWIVEC
 60h	DWORD	-PRIVEC
 64h	DWORD	-INTMAP
 68h	DWORD	-PRIMAP
 6Ch	DWORD	VCPI: master 8259 interrupt vector base (IRQ0 mapping)
 70h	DWORD	VCPI: slave 8259 interrupt vector base (IRQ8 mapping)
 74h	DWORD	BIOS print screen interrupt vector (0 if NEC)
 78h	DWORD	-EXTLOW setting
 7Ch	DWORD	-EXTHIGH setting
 80h	DWORD	lowest physical extended-memory address allocatable
 84h	DWORD	highest physical extended-memory address allocatable + 1
 88h	DWORD	special memory's physical base address (00000000h if none)
 8Ch	DWORD	special memory size in bytes (00000000h if none)
 90h	DWORD	-MAXVCPIMEM setting
 94h	DWORD	-VSCAN
 98h	DWORD	-SWAPCHK (0 = OFF, 1 = ON, 2 = FORCE, 3 = MAX)
 9Ch	DWORD	-CODESIZE setting
 A0h	DWORD	minimum swap file size (-MINSWFSIZE)
 A4h	DWORD	maximum swap fiel size (-MAXSWFSIZE)
 A8h	DWORD	page replacement policy (0 = LFU, 1 = NUR)
 ACh	DWORD	number of GDT entries (-NGDTENT)
 B0h	DWORD	number of LDT entries (-NLDTENT)
 B4h	DWORD	program's privilege level (0-3)
---386|DOS-Extender v3.0+ ---
 B8h	DWORD	-LOCKSTACK setting
 BCh	DWORD	-MAXEXTMEM
 C0h	DWORD	-MAXXMSMEM
 C4h	DWORD	-MAXPGMMEM
 C8h	DWORD	-DATATHRESHOLD
 CCh	DWORD	virtual memory manager flag (0 = not present, 1 = present)
 D0h	DWORD	Cyrix coprocessor flag (0 = no Cyrix EMC387, 1 = present)
 D4h	DWORD	-CYRIX setting (0 = AUTO, 1 = ON, 2 = OFF)
 D8h	DWORD	DPMI flag (0 = not present, 1 = present)
 DCh	DWORD	DPMI major version
 E0h	DWORD	DPMI minor version
 E4h	DWORD	DPMI capabilities flags (see #0592)
 E8h	DWORD	VCPI major version
 ECh	DWORD	VCPI minor version
 F0h	WORD	VCPI: IRQ0-7 physical base interrupt vector
 F2h	WORD	VCPI: IRQ8-15 physical base interrupt vector
 F4h	DWORD	XMS flag (0 = none, 1 = present)
 F8h	DWORD	XMS major version
 FCh	DWORD	XMS minor version
100h	WORD	application's CS selector
102h	WORD	application's DS selector
104h	WORD	application's PSP selector
106h	WORD	application's environment selector
108h	WORD	selector mapping entire first megabyte
10Ah	WORD	selector mapping text video memory
10Ch	WORD	selector mapping video memory (text for IBM, graphics for NEC)
10Eh	WORD	selector mapping Weitek address space, 0000h if not present
110h	WORD	selector mapping Cyrix EMC387 address space, 0000h if none
112h	WORD	reserved (0)
114h	DWORD	real-mode FAR entry point to call to switch to protected mode
		  with no saved context
118h	DWORD	size of LDT in bytes
---386|DOS-Extender v5.0+ ---
11Ch	DWORD	Windows flag (0 = not present, 1 = Windows present)
120h	DWORD	Windows major version
124h	DWORD	Windows minor version
128h	DWORD	Windows mode (0 = real/standard, 1 = enhanced)
12Ch	DWORD	OS/2 flag (0 = not present, 1 = OS/2 present)
130h	DWORD	OS/2 major version
134h	DWORD	OS/2 minor version
138h 50 DWORDs	reserved (0)

Bitfields for flags 1:
Bit(s)	Description	(Table 0591)
 0	-NOPAGE specified
 1	-A20 specified
 2	-VDISK specified
 3	-XT specified
 4	-AT specified
 5	-MCA specified
 6	-EISA specified
 7	-NORMRES specified (NEC only)
 8	-HIGHRES specified (NEC only)
 9	set if -SWFGROW1ST, clear if -NOSWFGROW1ST
 10	-NOVM specified
 11	-SAVEREGS specified
 12	unused (clear)
 13	-NOVCPI specified
 14	-NOMUL specified
 15	-NOBMCHK specified
 16	-NOSPCLMEM or -NOBIM
 17	-NOPGEXP specified
 18	-SWAPDEFDISK specified
---v3.0+ ---
 19	-SAVEINTS specified
 20	-NOLOAD specified
 21	-PAGELOG specified
 22	-OPENDENY specified
 23	-ERRATA17 specified
---v4.1+ ---
 24	-NESTDPMI specified
 25	-NONESTDPMI specified
 26	-NODPMI specified
 27	-NOPCDWEITEK specified
---v4.2+ ---
 28	-WININT21 specified

Bitfields for DPMI capabilities flags:
Bit(s)	Description	(Table 0592)
 0	paging supported
 1	physical device mapping
 2	conventional memory mapping
 3	exceptions restartable
--------E-212527-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - EN/DISABLE STATE SAVE ON INTERRUPTS
	AX = 2527h
	EBX = new status (00h disabled, 01h enabled)
Return: CF clear
	EBX = previous state save flag
SeeAlso: AX=2528h
--------E-212528-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - READ REGISTERS AFTER CTRL-C INT
	AX = 2528h
	DS:EBX -> buffer for registers (see #0593)
Return: CF clear if successful
	    DS:EBX buffer filled
	CF set on error
	    EAX = error code
		83h interrupt state save not enabled
		84h no active interrupt
SeeAlso: AX=2527h

Format of Phar Lap buffer for registers:
Offset	Size	Description	(Table 0593)
 00h  8 BYTEs	unused
 08h  4	DWORDs	EAX,EBX,ECX,EDX
 18h  4 DWORDs	ESI,EDI,EBP,ESP
 28h  6 WORDs	CS,DS,SS,ES,FS,GS
 34h	DWORD	EIP
 38h	DWORD	EFLAGS
--------E-212529-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - LOAD FLAT MODEL .EXP or .REX FILE
	AX = 2529h
	???
Return: ES:EBX -> parameter block (see #0594)
	???
Note:	details not available at this time
SeeAlso: AX=252Ah

Format of Phar Lap program load parameter block:
Offset	Size	Description	(Table 0594)
 00h	DWORD	initial EIP
 04h	WORD	initial CS
 06h	DWORD	initial ESP
 0Ah	WORD	initial SS
 0Ch  4 WORDs	initial DS, ES, FS, GS
 14h	DWORD	minimum size in bytes of program segment
 18h	DWORD	bytes of additional memory allocated
 1Ch	DWORD	flags
		bit 0: child linked with -UNPRIVILEGED
		---v6.0+ ---
		bit 1: child is PE file instead of .EXP
		bit 2: loaded file is a DLL
		bits 3-31 reserved
---v6.0+ ---
 20h	DWORD	module handles (PE files only)
 24h  7 DWORDs	reserved (0)
--------E-21252A-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM - NEW LOAD PROGRAM FOR DEBUG
	AX = 252Ah
	DS:EDX -> ASCIZ program name
	ES:EBX -> parameter block (see #0588)
	ECX = size of LDT buffer in bytes
	ESI = bit flags
	    bit 0: allow demand paging rather than loading entire program
	    bit 1: demand page from swap file rather than from .EXP
Return: CF clear if successful
	    EAX = VMM handle or FFFFFFFFh if none
	    ECX = number of descriptors in LDT buffer
	CF set on error
	    EAX = error code
		02h file error
		    EBX = file error code (see #0595)
		    ECX = DOS error code if EBX=1,2,3, or 8
		08h insufficient memory
		    EBX = memory error code (see #0596)
		80h LDT buffer too small
		87h called twice without intervening call to AX=2531h
SeeAlso: AX=2512h,AX=2517h,AX=2529h,AX=2531h

(Table 0595)
Values for Phar Lap file error code:
 01h	DOS open error
 02h	DOS seek error
 03h	DOS read error
 04h	not an .EXP or .REX file
 05h	invalid file format
 06h	-OFFSET is not a multiple of 64K
 07h	-NOPAGE incompatible with -REALBREAK/-OFFSET
 08h	DOS error loading .EXE file

(Table 0596)
Values for Phar Lap memory error code:
 01h	out of physical memory
 02h	out of swap space
 04h	unable to change extended memory allocation
 05h	-MAXPGMMEM exceeded
 06h	insufficient low memory to REALBREAK value
 07h	insufficient low memory for PSP and environment
--------E-21252BBH00-------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender - CREATE UNMAPPED PAGES
	AX = 252Bh
	BH = 00h
	???
Return: ???
--------E-21252BBH01-------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender - CREATE ALLOCATED PAGES
	AX = 252Bh
	BH = 01h
	???
Return: ???
--------E-21252BBH02-------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender - CREATE PHYSICAL DEVICE PAGES
	AX = 252Bh
	BH = 02h
	???
Return: ???
--------E-21252BBH03-------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender - MAP DATA FILE
	AX = 252Bh
	BH = 03h
	???
Return: ???
SeeAlso: AX=252Bh/BL=0Bh
--------E-21252BBH04-------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender - GET PAGE TYPES
	AX = 252Bh
	BH = 04h
	???
Return: ???
Note:	returns one word per page
SeeAlso: #0597

Bitfields for Phar Lap page information:
Bit(s)	Description	(Table 0597)
 7	mapped to read/write data file
 6	mapped to read-only data file
 5	swapped to disk
 4	locked
 3-0	page type
	0 unmapped
	1 allocated
	2 physical device page
--------E-21252B-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - VIRTUAL MEMORY MANAGEMENT - PAGE LOCKING
	AX = 252Bh
	BH = function
	    05h lock pages
	    06h unlock pages
	BL = address type
	    00h linear address
		ECX = linear start address of memory region
	    01h segmented address
		ES:ECX -> start of memory region
	EDX = size of memory region in bytes
Return: CF clear if successful
	CF set on error
Note:	this function is also supported by FlashTek X-32VM; if X-32 is not
	  using virtual memory, this function always succeeds
--------E-21252B-----------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender - FREE PHYSICAL PAGES
	AX = 252Bh
	BH = function (07h,08h)
	???
Return: ???
--------E-21252BBH09-------------------------
INT 21 P - Phar Lap 386/DOS-Extender v4.1 - GET PAGETABLE ENTRY/PAGE TABLE INFO
	AX = 252Bh
	BH = 09h
	BL = subfunction
	    00h get page table entry by linear address
		ECX = linear address for which to get page table entry
	    01h get page table entry by logical address
		ES:ECX = address for which to get page table entry
Return: CF clear if successful
	    EAX = page table entry
	    EBX = additional page table information
	CF set on error
	    EAX = error code
		0009h invalid address
		0082h running under DPMI
SeeAlso: AX=251Dh,AX=252Bh/BH=0Ah
--------E-21252BBH0A-------------------------
INT 21 P - Phar Lap 386/DOS-Extender v4.1 - SET PAGETABLE ENTRY/PAGE TABLE INFO
	AX = 252Bh
	BH = 0Ah
	BL = subfunction
	    00h set page table entry for linear address
		ECX = linear address for which to get page table entry
	    01h set page table entry for logical address
		ES:ECX = address for which to get page table entry
	ESI = page table entry
	EDI = additional page table information
Return: CF clear if successful
	CF set on error
	    EAX = error code
		0009h invalid address
		0082h running under DPMI
SeeAlso: AX=252Bh/BH=09h
--------E-21252BBH0B-------------------------
INT 21 P - Phar Lap 386/DOS-Extender v4.1+ - MAP DATA FILE AT FILE OFFSET
	AX = 252Bh
	BH = 0Bh
	BL = subfunction
	    00h by linear address
		ECX = linear address at which to map data file
	    01h by logical address
		ES:ECX = logical address at which to map data file
	EDX = number of bytes to map
	DS:ESI -> mapping structure (see #0598)
	DS:EDI -> ASCIZ filename
Return: CF clear if successful
	CF set on error
	    EAX = error code
		0002h file error
		    ECX = phase (01h opening file, 02h seeking, 03h reading)
		    EDX = error code returned by DOS
		0009h invalid address
		0081h invalid parameters or 386|VMM not present
		0086h all 386|VMM file handles already in use
SeeAlso: AX=252Bh/BH=03h,AX=252Bh/BH=09h

Format of Phar Lap mapping structure:
Offset	Size	Description	(Table 0598)
 00h	DWORD	starting file offset to be mapped
 04h	DWORD	DOS file access and sharing modes (see #0628 at INT 21/AH=3Dh)
--------E-21252C-----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v3.0 - ADD UNMAPPED PAGES AT END OF SEGMENT
	AX = 252Ch
	BX = segment selector
	ECX = number of 4K pages to add
Return: CF clear if successful
	    EAX = offset in segment of beginning of unmapped pages
	CF set on error
	    EAX = error code
		08h insufficent memory
		09h invalid selector
		82h not supported by current DPMI
--------E-21252D-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM v2.3+ - CLOSE VMM FILE HANDLE
	AX = 252Dh
	EBX = VMM file handle
Return: CF clear if successful
	CF set on error
	    EAX = error code (81h invalid VMM handle)
--------E-21252E-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM v2.3+ - GET/SET VMM PARAMETERS
	AX = 252Eh
	CL = direction (00h get parameters, 01h set parameters)
	DS:EBX -> parameter buffer (see #0599)
Return: CF clear if successful
	CF set on error
	    EAX = error code (81h bad parameter value)

Format of Phar Lap VMM parameter buffer:
Offset	Size	Description	(Table 0599)
 00h	DWORD	flags
		bit 0: page fault logging enabled
		---v5.0+ ---
		bit 1: swap extender to disk during DOS EXEC call
		bit 2: don't zero allocated memory
 04h	DWORD	scan period for page aging, in milliseconds
 08h	DWORD	maximum size (in bytes) to check on each page scan
 0Ch 52 BYTEs	unused
--------E-21252F-----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v3.0 - WRITE RECORD TO VMM PAGE LOG FILE
	AX = 252Fh
	DS:EBX -> data to be written
	CX = size of data in bytes
Return: CF clear if successful
	CF set on error
	    EAX = error code (85h no page log file or not 386/VMM)
--------E-212530-----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v2.3+ - SET SIZE OF BUFFER FOR DOS CALLS
	AX = 2530h
	ECX = size of data buffer in bytes (1024 to 65536)
Return: CF clear if successful
	CF set on error
	    EAX = error code
		08h insufficient low memory
		81h invalid size
SeeAlso: AX=2517h
--------E-212531-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM v3.0 - READ/WRITE LDT DESCRIPTOR
	AX = 2531h
	BX = segment selector
	ECX = direction (00h read, 01h write)
	DS:EDX -> 8-byte buffer for descriptor contents
Return: CF clear if successful
	CF set on error
	    EAX = error code
		81h invalid selector
		82h DPMI running, or not a code or data segment
--------E-212532-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - GET EXCEPTION HANDLER VECTOR
	AX = 2532h
	CL = exception number (00h-0Fh)
Return: CF clear if successful
	    ES:EBX = CS:EIP of current exception handler
	CF set on error (CL > 0Fh)
Notes:	this call is also supported by the FlashTek X-32VM extender
	this function is incompatible with 386|VMM; use AX=2522h instead
SeeAlso: AX=2522h,AX=2533h
--------E-212533-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - SET EXCEPTION HANDLER VECTOR
	AX = 2533h
	CL = exception number (00h-0Fh)
	DS:EDX = CS:EIP of new exception handler
Return: CF clear if successful
	CF set on error (CL > 0Fh)
Notes:	this call is also supported by the FlashTek X-32VM extender
	this function is incompatible with 386|VMM; use AX=2522h instead
SeeAlso: AX=2522h,AX=2532h
--------E-212534-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender v3.0+ - GET INTERRUPT FLAG
	AX = 2534h
Return: CF clear
	EAX = interrupt state (00h disabled, 01h enabled)
--------E-212535-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender v3.0+ - READ/WRITE SYSTEM REGISTERS
	AX = 2535h
	EBX = direction (00h read registers, 01h write)
	DS:EDX -> system register record (see #0600)
Return: CF clear
Note:	this call is only available under MS Windows if PHARLAP.386 VDD is
	  installed

Format of Phar Lap system register record:
Offset	Size	Description	(Table 0600)
 00h	DWORD	CR0
 04h  4 DWORDs	DR0,DR1,DR2,DR3
 14h  2 DWORDs	reserved
 1Ch  2 DWORDs	DR6,DR7
 24h  3 DWORDs	reserved
--------E-212536----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v3.0+ - MIN/MAX EXTENDED/CONV MEMORY USAGE
	AX = 2536h
	EBX = bit flags
	    bit 0: modifying conventional memory rather than extended memory
	    bit 1: setting maximum memory usage rather than minimum
	ECX = new limit in 4K pages
Return: CF clear if successful
	    EAX = new limit
	CF set on error
	    EAX = error code (08h memory error or -NOPAGE set)
	    EBX = maximum limit in pages
	    ECX = minimum limit in pages
--------E-212537----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v3.0 - ALLOCATE DOS MEMORY ABOVE DOS BUFFER
	AX = 2537h
	BX = number of paragraphs to allocate
Return: CF clear if successful
	    AX = real-mode segment of allocated block
	CF set on error
	    AX = error code
		07h MS-DOS memory chain corrupted
		08h insufficient low memory
	    BX = size in paragraphs of largest free block
SeeAlso: AH=48h
--------E-212538----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v3.0 - READ PROTMODE REGS AFTER SFTWARE INT
	AX = 2538h
	DS:EBX -> buffer for registers (see #0593)
	ECX = register record to retrieve
	    00h first interrupt state
	    01h next interrupt state
		EDX = handle for current interrupt state
Return: CF clear if successful
	    DS:EBX buffer filled
	    EDX = handle of current interrupt state
	    ESI = number of interrupt which occurred
	CF set on error
	    EAX = error code
		81h invalid handle in EDX
		83h register saving not enabled
		84h no more interrupt states
SeeAlso: AX=2527h,AX=2528h
--------E-212539----------------------------
INT 21 P - Phar Lap 386/DOS-Ext VMM v3.0 - GET OFFSET OF .EXP FILE HEADER
	AX = 2539h
	BX = MS-DOS file handle for open file
Return: CF clear if successful
	    EAX = offset of .EXP header in file
	CF set on error
	    EAX = error code (02h file error)
	    EBX = file error code
		02h DOS error seeking
		03h DOS error reading
		04h invalid file type	
		05h invalid file format
	    ECX = DOS error code if EBX=02h or 03h
	current file position in file modified
--------E-21253A----------------------------
INT 21 P - Phar Lap 386/DOS-Extender v3.0+ - INSTALL MOD. SEG FAILURE HANDLER
	AX = 253Ah
	ES:EBX -> function to be called when INT 21/AH=4Ah is about to return
		an error
Return: CF clear
	ES:EBX -> previous handler
SeeAlso: AH=4Ah
--------E-21253B----------------------------
INT 21 P - Phar Lap 386/DOS-Extender v3.0+ - JUMP TO REAL MODE CODE, NO CONTEXT
	AX = 253Bh
	DS:EBX -> buffer containing register contents (see #0593)
Return: never returns
SeeAlso: AX=2528h
--------E-21253C-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender VMM v3.0+ - SHRINK 386|VMM SWAP FILE
	AX = 253Ch
Return: CF clear
	EAX = old size of swap file in bytes
	EBX = new size of swap file in bytes
--------E-21253D-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender v4.0+ - READ/WRITE IDT DESCRIPTOR
	AX = 253Dh
	BL = interrupt number
	ECX = direction (0 = read, 1 = write)
	DS:EDX -> 8-byte buffer for descriptor
Return: CF clear if successful
	    DS:EDX filled if reading
	CF set on error
	    EAX = error code (0082h if running under DPMI)
Desc:	access hardware-level IDT rather than the internal 386/DOS-Extender
	  shadow IDT
Notes:	this call will always fail under DPMI because it is not possible to
	  access the IDT
	the descriptor is not checked when writing
	this call can normally be used only by programs running in ring 0
	  because the processor does not allow an interrupt to be vectored to
	  a less privileged ring
--------E-21253F-----------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender v6.0+ - ALLOCATE LDT DESCRIPTOR
	AX = 253Fh
	BX = LDT descriptor to allocate (0000h for any)
	???
Return: ???
--------E-212540-----------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender v6.0+ - FORCE ALIAS OF SEGMENT
	AX = 2540h
	???
Return: ???
--------E-212544-----------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender v6.0+ - FREE DLL
	AX = 2544h
	???
Return: ???
--------E-212545-----------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender v6.0+ - GET/SET PROCEDURE ADDRESS
	AX = 2545h
	ECX = direction (00h get, 01h set)
	???
Return: ???
--------E-212546-----------------------------
INT 21 Pu - Phar Lap 386/DOS-Extender v6.0+ - GET MODULE HANDLE
	AX = 2546h
	???
Return: ???
--------E-2125C0-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - ALLOCATE MS-DOS MEMORY BLOCK
	AX = 25C0h
	BX = number of 16-byte paragraphs of MS-DOS memory requested
Return: CF clear if successful
	    AX = real-mode paragraph address of memory
	CF set on error
	    AX = error code
		07h MS-DOS memory control blocks destroyed
		08h insufficient memory
	    BX = size in paragraphs of largest available memory block
SeeAlso: AX=25C1h,AX=25C2h
--------E-2125C1-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - RELEASE MS-DOS MEMORY BLOCK
	AX = 25C1h
	CX = real-mode paragraph address of memory block to free
Return: CF clear if successful
	    EAX destroyed
	CF set on error
	    AX = error code
		07h MS-DOS memory control blocks destroyed
		09h invalid memory block address in CX
SeeAlso: AX=25C0h,AX=25C2h
--------E-2125C2-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - MODIFY MS-DOS MEMORY BLOCK
	AX = 25C2h
	BX = new requested block size in paragraphs
	CX = real-mode paragraph address of memory block to modify
Return: CF clear if successful
	    EAX destroyed
	CF set on error
	    AX = error code
		07h MS-DOS memory control blocks destroyed
		08h insufficient memory
		09h invalid memory block address in CX
	    BX = size in paragraphs of largest available memory block
SeeAlso: AX=25C0h,AX=25C1h
--------E-2125C3-----------------------------
INT 21 P - Phar Lap 386/DOS-Extender - EXECUTE PROGRAM
	AX = 25C3h
	ES:EBX -> pointer to parameter block (see #0602)
	DS:EDX -> pointer to ASCIZ program filename
Return: CF clear if successful
	    all registers unchanged
	CF set on error
	    EAX = error code (see #0601)

(Table 0601)
Values for Phar Lap error code:
 01h	function code in AL is invalid ???
 02h	file not found or path invalid
 05h	access denied
 08h	insufficient memory to load program
 0Ah	environment invalid
 0Bh	invalid file format

Format of parameter block:
Offset	Size	Description	(Table 0602)
 00h	DWORD	32-bit offset of environment string
 04h	WORD	segment selector of environment string
 06h	DWORD	32-bit offset of command-tail string
 0Ah	WORD	segment selector of command-tail string
--------D-2126-------------------------------
INT 21 - DOS 1+ - CREATE NEW PROGRAM SEGMENT PREFIX
	AH = 26h
	DX = segment at which to create PSP (see #0603)
Notes:	new PSP is updated with memory size information; INTs 22h, 23h, 24h
	  taken from interrupt vector table; the parent PSP field is set to 0
	(DOS 2+) DOS assumes that the caller's CS is the segment of the PSP to
	  copy
SeeAlso: AH=4Bh,AH=50h,AH=51h,AH=55h,AH=62h,AH=67h

Format of Program Segment Prefix (PSP):
Offset	Size	Description	(Table 0603)
 00h  2 BYTEs	INT 20 instruction for CP/M CALL 0 program termination
		the CDh 20h here is often used as a signature for a valid PSP
 02h	WORD	segment of first byte beyond memory allocated to program
 04h	BYTE	(DOS) unused filler
		(OS/2) count of fake DOS version returns
 05h	BYTE	CP/M CALL 5 service request (FAR CALL to absolute 000C0h)
		BUG: (DOS 2+ DEBUG) PSPs created by DEBUG point at 000BEh
 06h	WORD	CP/M compatibility--size of first segment for .COM files
 08h  2 BYTEs	remainder of FAR JMP at 05h
 0Ah	DWORD	stored INT 22 termination address
 0Eh	DWORD	stored INT 23 control-Break handler address
 12h	DWORD	DOS 1.1+ stored INT 24 critical error handler address
 16h	WORD	segment of parent PSP
 18h 20 BYTEs	DOS 2+ Job File Table, one byte per file handle, FFh = closed
 2Ch	WORD	DOS 2+ segment of environment for process (see #0604)
 2Eh	DWORD	DOS 2+ process's SS:SP on entry to last INT 21 call
 32h	WORD	DOS 3+ number of entries in JFT (default 20)
 34h	DWORD	DOS 3+ pointer to JFT (default PSP:0018h)
 38h	DWORD	DOS 3+ pointer to previous PSP (default FFFFFFFFh in 3.x)
		used by SHARE in DOS 3.3
 3Ch	BYTE	DOS 4+ (DBCS) interim console flag (see AX=6301h)
 3Dh	BYTE	(APPEND) TrueName flag (see INT 2F/AX=B711h)
 3Eh	BYTE	(Novell NetWare) flag: next byte initialized if CEh
		(OS/2) capabilities flag
 3Fh	BYTE	(Novell NetWare) Novell task number if previous byte is CEh
 40h  2 BYTEs	DOS 5+ version to return on INT 21/AH=30h
 42h	WORD	(MSWindows3) selector of next PSP (PDB) in linked list
		Windows keeps a linked list of Windows programs only
 44h	WORD	(MSWindows3) "PDB_Partition"
 46h	WORD	(MSWindows3) "PDB_NextPDB"
 48h	BYTE	(MSWindows3) bit 0 set if non-Windows application (WINOLDAP)
 49h	BYTE	unused by DOS versions <= 6.00
 4Ch	WORD	(MSWindows3) "PDB_EntryStack"
 4Eh  2 BYTEs	unused by DOS versions <= 6.00
 50h  3 BYTEs	DOS 2+ service request (INT 21/RETF instructions)
 53h  2 BYTEs	unused in DOS versions <= 6.00
 55h  7 BYTEs	unused in DOS versions <= 6.00; can be used to make first FCB
		  into an extended FCB
 5Ch 16 BYTEs	first default FCB, filled in from first commandline argument
		overwrites second FCB if opened
 6Ch 16 BYTEs	second default FCB, filled in from second commandline argument
		  overwrites beginning of commandline if opened
 7Ch  4 BYTEs	unused
 80h 128 BYTEs	commandline / default DTA
		command tail is BYTE for length of tail, N BYTEs for the tail,
		  followed by a BYTE containing 0Dh
Notes:	in DOS v3+, the limit on simultaneously open files may be increased by
	  allocating memory for a new open file table, filling it with FFh,
	  copying the first 20 bytes from the default table, and adjusting the
	  pointer and count at 34h and 32h.  However, DOS will only copy the
	  first 20 file handles into a child PSP (including the one created on
	  EXEC).
	network redirectors based on the original MS-Net implementation use
	  values of 80h-FEh in the open file table to indicate remote files;
	  Novell NetWare also uses values from FEh down to 80h or one more than
	  FILES= (whichever is greater) to indicate remote files
	MS-DOS 5.00 incorrectly fills the FCB fields when loading a program
	  high; the first FCB is empty and the second contains the first
	  parameter
	some DOS extenders place protected-mode values in various PSP fields
	  such as the "parent" field, which can confuse PSP walkers.  Always
	  check either for the CDh 20h signature or that the suspected PSP is
	  at the beginning of a memory block which owns itself (the preceding
	  paragraph should be a valid MCB with "owner" the same as the
	  suspected PSP).
	Novell NetWare updates the fields at offsets 3Eh and 3Fh without
	  checking that a legal PSP segment is current; see AH=50h for further
	  discussion

Format of environment block:
Offset	Size	Description	(Table 0604)
 00h  N BYTEs	first environment variable, ASCIZ string of form "var=value"
      N BYTEs	second environment variable, ASCIZ string
	...
      N BYTEs	last environment variable, ASCIZ string of form "var=value"
	BYTE	00h
---DOS 3+---
	WORD	number of strings following environment (normally 1)
      N BYTEs	ASCIZ full pathname of program owning this environment
		other strings may follow
--------D-2127-------------------------------
INT 21 - DOS 1+ - RANDOM BLOCK READ FROM FCB FILE
	AH = 27h
	CX = number of records to read
	DS:DX -> opened FCB (see #0574)
Return: AL = status
	    00h successful, all records read
	    01h end of file, no data read
	    02h segment wrap in DTA, no data read
	    03h end of file, partial read
	[DTA] = records read from file
	CX = number of records read (return AL = 00h or 03h)
Notes:	read begins at current file position as specified in FCB; the file
	  position is updated after reading
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=21h,AH=28h,AH=3Fh
--------D-2128-------------------------------
INT 21 - DOS 1+ - RANDOM BLOCK WRITE TO FCB FILE
	AH = 28h
	CX = number of records to write
	DS:DX -> opened FCB (see #0574)
	[DTA] = records to write
Return: AL = status
	    00h successful
	    01h disk full or file read-only
	    02h segment wrap in DTA
	CX = number of records written
Notes:	write begins at current file position as specified in FCB; the file
	  position is updated after writing
	if CX = 0000h on entry, no data is written; instead the file size is
	  adjusted to be the same as the file position specified by the random
	  record and record size fields of the FCB
	if the data to be written is less than a disk sector, it is copied into
	  a DOS disk buffer, to be written out to disk at a later time
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=22h,AH=27h,AH=40h,AH=59h
--------D-2129-------------------------------
INT 21 - DOS 1+ - PARSE FILENAME INTO FCB
	AH = 29h
	AL = parsing options (see #0605)
	DS:SI -> filename string (both '*' and '?' wildcards OK)
	ES:DI -> buffer for unopened FCB
Return: AL = result code
	    00h successful parse, no wildcards encountered
	    01h successful parse, wildcards present
	    FFh failed (invalid drive specifier)
	DS:SI -> first unparsed character
	ES:DI buffer filled with unopened FCB (see #0574)
Notes:	asterisks expanded to question marks in the FCB
	all processing stops when a filename terminator is encountered
	cannot be used with filespecs which include a path (DOS 2+)
	Novell NetWare monitors the result code since an 'invalid drive' may
	  signal an attempt to reconnect a network drive; if there are no
	  connections to the specified drive, NetWare attempts to build a
	  connection and map the drive to the SYS:LOGIN directory
SeeAlso: AH=0Fh,AH=16h,AH=26h

Bitfields for parsing options:
Bit(s)	Description	(Table 0605)
 0	skip leading separators
 1	use existing drive number in FCB if no drive is specified, instead of
	  setting field to zero
 2	use existing filename in FCB if no base name is specified, instead of
	  filling field with blanks
 3	use existing extension in FCB if no extension is specified, instead of
	  filling field with blanks
 4-7	reserved (0)
--------D-212A-------------------------------
INT 21 - DOS 1+ - GET SYSTEM DATE
	AH = 2Ah
Return: CX = year (1980-2099)
	DH = month
	DL = day
---DOS 1.10+---
	AL = day of week (00h=Sunday)
SeeAlso: AH=2Bh"DOS",AH=2Ch,AH=E7h,INT 1A/AH=04h,INT 2F/AX=120Dh
--------D-212B-------------------------------
INT 21 - DOS 1+ - SET SYSTEM DATE
	AH = 2Bh
	CX = year (1980-2099)
	DH = month
	DL = day
Return: AL = status
	    00h successful
	    FFh invalid date, system date unchanged
Note:	DOS 3.3+ also sets CMOS clock
SeeAlso: AH=2Ah,AH=2Dh,INT 1A/AH=05h
--------E-212B--CX4149-----------------------
INT 21 - AI Architects - ??? - INSTALLATION CHECK
	AH = 2Bh
	CX = 4149h ('AI')
	DX = 413Fh ('A?')
Return: AL <> FFh if installed
Note:	Borland's TKERNEL makes this call
--------c-212B--CX4358-----------------------
INT 21 - Super PC-Kwik v3.20+ - INSTALLATION CHECK
	AH = 2Bh
	CX = 4358h ('CX')
Return: AL = FFh if PC-Kwik/PC-Cache not installed
	AL = 00h if installed
	    CF clear
	    CX = 6378h ('cx')
	    BX = ???
	    DX = version (DH = major version, DL = binary minor version)
Note:	PC Tools PC-Cache v5.x and Qualitas Qcache v4.00 are OEM versions of
	  Super PC-Kwik, and thus support this call (PC-Cache 5.1 corresponds
	  to PC-Kwik v3.20)
SeeAlso: INT 13/AH=A0h,INT 13/AH=B0h,INT 16/AX=FFA5h/CX=1111h
Index:	PC-Cache;installation check|Qualitas Qcache;installation check
Index:	installation check;PC-Cache 5.x|installation check;Qualitas Qcache
--------Q-212B--CX4445-----------------------
INT 21 - DESQview - INSTALLATION CHECK
	AH = 2Bh
	CX = 4445h ('DE')
	DX = 5351h ('SQ')
	AL = subfunction (DV v2.00+)
	    01h get version
		Return: BX = version (BH = major, BL = minor)
		Note: early copies of v2.00 return 0002h
	    02h get shadow buffer info, and start shadowing
		Return: BH = rows in shadow buffer
			BL = columns in shadow buffer
			DX = segment of shadow buffer
	    04h get shadow buffer info
		Return: BH = rows in shadow buffer
			BL = columns in shadow buffer
			DX = segment of shadow buffer
	    05h stop shadowing
Return: AL = FFh if DESQview not installed
Notes:	in DESQview v1.x, there were no subfunctions; this call only identified
	  whether or not DESQview was loaded.  DESQview v2.52 performs function
	  01h for all subfunction requests 0Ch and higher and appears to ignore
	  all lower-numbered functions not listed here.
	DESQview versions 2.50-2.52 are part of DESQview/X v1.0x; version 2.53
	  is part of DESQview/X v1.10; and version 2.63 is part of DESQview/X
	  v2.00.
BUG:	subfunction 05h does not appear to work correctly in DESQview 2.52
SeeAlso: INT 10/AH=FEh,INT 10/AH=FFh,INT 15/AX=1024h,INT 15/AX=DE30h
--------U-212B--CX454C-----------------------
INT 21 - ELRES v1.1 - INSTALLATION CHECK
	AH = 2Bh
	CX = 454Ch ('EL')
	DX = 5253h ('RS')
Return: ES:BX -> ELRES history structure (see #0606)
	DX = DABEh (signature, DAve BEnnett)
Program: ELRES is an MS-DOS return code (errorlevel) recorder by David H.
	  Bennett which stores recent errorlevel values, allows them to be
	  retrieved for use in batch files, and can place them in an
	  environment variable
SeeAlso: AH=4Bh"ELRES",AH=4Dh

Format of ELRES history structure:
Offset	Size	Description	(Table 0606)
 00h	WORD	number of return codes which can be stored by following buffer
 02h	WORD	current position in buffer (treated as a ring)
 04h  N BYTEs	ELRES buffer
--------m-212B01CX444D-----------------------
INT 21 - Quarterdeck DOS-UP.SYS v2.00 - INSTALLATION CHECK
	AX = 2B01h
	CX = 444Dh ('DM')
	DX = 4158h ('AX')
Return: AX = 0000h if installed
	    BX = version??? (0002h)
	    CX = 4845h ('HE')
	    DX = 5245h ('RE')
	    ES = DOS-UP driver segment
--------T-212B01CX5441-----------------------
INT 21 - TAME v2.10+ - INSTALLATION CHECK
	AX = 2B01h
	CX = 5441h ('TA')
	DX = 4D45h ('ME')
---v2.60---
	BH = ???
	    00h skip ???, else do
Return: AL = 02h if installed
	ES:DX -> data area in TAME-RES (see #0607,#0611,#0613)
Program: TAME is a shareware program by David G. Thomas which gives up CPU time
	  to other partitions under a multitasker when the current partition's
	  program incessantly polls the keyboard or system time

Format of TAME 2.10-2.20 data area:
Offset	Size	Description	(Table 0607)
 00h	BYTE	data structure minor version number (01h in TAME 2.20)
 01h	BYTE	data structure major version number (07h in TAME 2.20)
 02h	DWORD	number of task switches
 06h	DWORD	number of keyboard polls
 0Ah	DWORD	number of time polls
 0Eh	DWORD	number of times DESQview told program runs only in foreground
 12h	DWORD	original INT 10h
 16h	DWORD	original INT 14h
 1Ah	DWORD	original INT 15h
 1Eh	DWORD	original INT 16h
 22h	DWORD	original INT 17h
 26h	DWORD	original INT 21h
 2Ah	DWORD	original INT 28h
 2Eh	WORD	offset of TAME INT 10h handler
 30h	WORD	offset of TAME INT 14h handler
 32h	WORD	offset of TAME INT 15h handler
 34h	WORD	offset of TAME INT 16h handler
 36h	WORD	offset of TAME INT 17h handler
 38h	WORD	offset of TAME INT 21h handler
 3Ah	WORD	offset of TAME INT 28h handler
 3Ch	WORD	X in /max:X,Y or /freq:X,Y
 3Eh	WORD	Y in /max:X,Y or /freq:X,Y
 40h	WORD	number of polls remaining before next task switch
 42h	WORD	/KEYIDLE value
 44h	BYTE	interrupts already grabbed by TAME (see #0608)
 45h	BYTE	flags for interrupts which may be acted on (same bits as above)
 46h	BYTE	TAME enabled (01h) or disabled (00h)
 47h	BYTE	/TIMEPOLL (01h) or /NOTIMEPOLL (00h)
 48h	BYTE	/NOTIMER (01h) or /TIMER (00h)
 49h	BYTE	window or task number for this task
 4Ah	BYTE	multitasker type (see #0609)
 4Bh	BYTE	type of task switching selected
		bit 0: DESQview???
		bit 1: DoubleDOS???
		bit 2: TopView???
		bit 3: KeySwitch
		bit 4: HLT instruction
 4Ch	BYTE	???
 4Dh	BYTE	flags
		bit 1: /FREQ instead of /MAX
 4Eh	BYTE	/FG: value
 4Fh	BYTE	task switches left until next FGONLY DESQview API call
 50h	BYTE	???

Bitfields for interrupts already grabbed by TAME:
Bit(s)	Description	(Table 0608)
 0	INT 10h
 1	INT 14h
 2	INT 15h
 3	INT 16h
 4	INT 17h
 5	INT 21h
 6	INT 28h

(Table 0609)
Values for multitasker type:
 01h	DESQview
 02h	DoubleDOS
 03h	TopView
 04h	OmniView
 05h	VM/386

Bitfields for type of task switching selected:
Bit(s)	Description	(Table 0610)
 0	DESQview
 1	DoubleDOS
 2	TopView
 3	OmniView
 4	KeySwitch
 5	HLT instruction

Format of TAME 2.30 data area:
Offset	Size	Description	(Table 0611)
 00h	BYTE	data structure minor version number (02h in TAME 2.30)
 01h	BYTE	data structure major version number (0Ah in TAME 2.30)
 02h	DWORD	number of task switches
 06h	DWORD	number of keyboard polls
 0Ah	DWORD	number of time polls
 0Eh	DWORD	number of times DESQview told program runs only in foreground
 12h	DWORD	time of last /CLEAR or TAME-RES load
 16h	DWORD	time yielded
 1Ah	DWORD	time spent polling
 1Eh	DWORD	time spent waiting on key input with INT 16/AH=01h,11h
 22h	DWORD	original INT 10h
 26h	DWORD	original INT 14h
 2Ah	DWORD	original INT 15h
 2Eh	DWORD	original INT 16h
 32h	DWORD	original INT 17h
 36h	DWORD	original INT 21h
 3Ah	DWORD	original INT 28h
 3Eh	WORD	offset of TAME INT 10h handler
 40h	WORD	offset of TAME INT 14h handler
 42h	WORD	offset of TAME INT 15h handler
 44h	WORD	offset of TAME INT 16h handler
 46h	WORD	offset of TAME INT 17h handler
 48h	WORD	offset of TAME INT 21h handler
 4Ah	WORD	offset of TAME INT 28h handler
 4Ch	WORD	X in /max:X,Y or /freq:X,Y
 4Eh	WORD	Y in /max:X,Y or /freq:X,Y
 50h	WORD	number of polls remaining before next task switch
 52h	WORD	/KEYIDLE value
 54h	WORD	/FG: value
 56h	WORD	task switches left until next FGONLY DESQview API call
 58h	WORD	multitasker version
 5Ah	WORD	virtual screen segment
 5Ch	BYTE	interrupts already grabbed by TAME (see #0608)
 5Dh	BYTE	flags for interrupts which may be acted on (same bits as above)
 5Eh	BYTE	window or task number for this task
 5Fh	BYTE	multitasker type (see #0609)
 60h	BYTE	type of task switching selected (bit flags) (see #0610)
 61h	BYTE	watch_DOS
 62h	BYTE	action flags (see #0612)
 63h	BYTE	old status
 64h	WORD	signature DA34h

Bitfields for TAME action flags:
Bit(s)	Description	(Table 0612)
 0	TAME enabled
 1	/FREQ instead of /MAX (X and Y count fields are per tick)
 2	/TIMEPOLL
 3	/KEYPOLL
 4	inhibit timer
 5	enable status monitoring
SeeAlso: #0611,#0613

Format of TAME 2.60 data area:
Offset	Size	Description	(Table 0613)
 00h	BYTE	data structure minor version number (02h in TAME 2.60)
 01h	BYTE	data structure major version number (0Bh in TAME 2.60)
 02h	DWORD	number of task switches
 06h	DWORD	number of keyboard polls
 0Ah	DWORD	number of time polls
 0Eh	DWORD	number of times DESQview told program runs only in foreground
 12h	DWORD	time of last /CLEAR or TAME-RES load
 16h	DWORD	time yielded
 1Ah	DWORD	time spent polling
 1Eh	DWORD	time spent waiting on key input with INT 16/AH=01h,11h
 22h  4 BYTEs	???
 26h	DWORD	original INT 10h
 2Ah	DWORD	original INT 14h
 2Eh	DWORD	original INT 15h
 32h	DWORD	original INT 16h
 36h	DWORD	original INT 17h
 3Ah	DWORD	original INT 21h
 3Eh	DWORD	original INT 28h
 42h	WORD	offset of TAME INT 10h handler
 44h	WORD	offset of TAME INT 14h handler
 46h	WORD	offset of TAME INT 15h handler
 48h	WORD	offset of TAME INT 16h handler
 4Ah	WORD	offset of TAME INT 17h handler
 4Ch	WORD	offset of TAME INT 21h handler
 4Eh	WORD	offset of TAME INT 28h handler
 50h	WORD	X in /max:X,Y or /freq:X,Y
 52h	WORD	Y in /max:X,Y or /freq:X,Y
 54h	WORD	number of polls remaining before next task switch
 56h	WORD	/KEYIDLE value
 58h  4 BYTEs	???
 5Ch	WORD	X in /boost:X,Y
 5Eh	WORD	Y in /boost:X,Y
 60h	WORD	/FG: value
 62h	WORD	task switches remaining until next FGONLY DESQview API call
 64h	WORD	multitasker version ???
 66h	WORD	virtual screen segment
 68h	BYTE	interrupts already grabbed by TAME (see #0608)
 69h	BYTE	flags for interrupts which may be acted on (same bits as above)
 6Ah	BYTE	window or task number for this task
 6Bh	BYTE	multitasker type (see #0609)
 6Ch	BYTE	type of task switching selected (bit flags) (see #0610)
 6Dh	BYTE	watch_DOS
 6Eh	BYTE	action flags (see #0612)
 6Fh	BYTE	old status
 70h	WORD	signature DA34h
--------v-212B16CX0643-----------------------
INT 21 - VIRUS - "Maltese Amoeba" - INSTALLATION CHECK
	AX = 2B16h
	CX = 0643h
Return: AX = 1603h if installed
--------R-212B44BX4D41-----------------------
INT 21 - pcANYWHERE IV/LAN - INSTALLATION CHECK
	AX = 2B44h ('D')
	BX = 4D41h ('MA')
	CX = 7063h ('pc')
	DX = 4157h ('AW')
Return: AX = resident program
	    4F4Bh ('OK') if large host resident
	    6F6Bh ('ok') if small host resident
	CX:DX -> API entry point (see #0614)
SeeAlso: INT 16/AH=79h

(Table 0614)
Call pcANYWHERE API entry point with:
	AX = 0000h get pcANYWHERE IV version
	    DS:SI -> BYTE buffer for host type code
	    Return: AH = version number
		    AL = revision number
		    DS:DI buffer byte filled with
			00h full-featured host
			01h limited-feature LAN host
			other API may not be supported
	AX = 0001h initialize operation
	    DS:SI -> initialization request structure (see #0615)
	    Return: AX = function status (see #0618)
	AX = 0002h get status
	    Return: AH = current operating mode (see init req structure below)
		    AL = current connection status (see #0617)
	AX = 0003h suspend remote screen updates
	    Return: AX = function status (see #0618)
	AX = 0004h resume screen updates
	    Return: AX = function status (see #0618)
	AX = 0005h end current remote access session
	    DS:SI -> termination request structure (see #0616)
	    Return: AX = function status (see #0618)
	AX = 0006h remove pcANYWHERE IV from memory
	    Return: AX = status (see #0618)
	AX = 8000h read data from communications channel
	    DS:BX -> buffer
	    CX = buffer size
	    Return: AX >= number of characters read/available
		    AX < 0 on error
	AX = 8001h write data to communications channel
	    DS:BX -> buffer
	    CX = buffer size
	    Return: AX >= number of characters written
		    AX < 0 on error
	AX = 8002h get connection status
	    Return: AX = status
			> 0000h if connection active
			= 0000h if connection lost
			< 0000h on error

Format of pcANYWHERE initialization request structure:
Offset	Size	Description	(Table 0615)
 00h	BYTE	operating mode
		00h wait for a call
		01h hot key activates
		02h incoming call activates
		03h initiate a call
 01h  3 BYTEs	user ID to append to config file names
 04h	WORD	DS-relative pointer to path for config files
 06h	WORD	DS-relative pointer to path for program files

Format of pcANYWHERE termination request structure:
Offset	Size	Description	(Table 0616)
 00h	BYTE	operating mode after termination
		00h wait for a call
		01h hot key activates
		02h incoming call activates
		80h use current mode
		FFh remove from memory

Bitfields for current connection status:
Bit(s)	Description	(Table 0617)
 0	a physical connection is active
 1	remove screen updating is active
 2	connection checking is active
 3	hot key detection is active
 4	background file transfer is active

(Table 0618)
Values for pcANYWHERE function status:
 0000h	function completed successfully
 FFD1h	unable to release interrupt vectors
 FFD2h	unable to release allocated memory
 FFF2h	unable to establish a connection when operating mode is
	  "Initiate a call"
 FFF3h	modem configuration is invalid (corrupt config)
 FFF4h	modem initialization failed (no modem response)
 FFF5h	the communications device could not be initialized
 FFF6h	the host operator aborted the function
 FFF7h	the communications driver type specified in the configuration file is
	  different than the one loaded when pcANYWHERE IV was started
 FFF9h	the configuration file is invalid
 FFFAh	the configuration file could not be found
 FFFBh	no session is active
 FFFCh	a remote access session is active
 FFFDh	the specified operating mode is invalid
----------212B--CX6269-----------------------
INT 21 - WDTSR.COM - INSTALLATION CHECK
	AH = 2Bh
	CX = 6269h ('bi')
	DX = 742Dh ('t-')
Return: AL = FFh if not installed
	AL = 77h ('w') if WDTSR is installed
	    CX = 6174h ('at')
	    DX = 6368h ('ch')
	    ES = resident code segment
	    ES:DI -> identification and configuration data
Program: WDTSR is a driver for the bitWatch watchdog hardware by bit-design
	  GmbH
SeeAlso: AH=2Bh/CX=6269h"bitFOSSI",INT 14/AH=14h"FOSSIL",INT 15/AH=C3h
--------S-212B--CX6269-----------------------
INT 21 - bitFOSS - INSTALLATION CHECK
	AH = 2Bh
	CX = 6269h ('bi')
	DX = 7446h ('tF')
Return: AL = FFh if not installed
	AL = 4Fh ('O') if bitFOSS is installed
	    CX = 5353h ('SS')
	    DX = 494Ch ('IL')
	    ES = resident code segment
	    ES:DI -> identification data
Program: bitFOSS is a revision 5 FOSSIL driver
SeeAlso: AH=2Bh/CX=6269h"bitFOSSI",INT 11/AH=BCh
--------S-212B--CX6269-----------------------
INT 21 - bitFOSSI - INSTALLATION CHECK
	AH = 2Bh
	CX = 6269h ('bi')
	DX = 7449h ('tI')
Return: AL = FFh if not installed
	AL = 53h ('S') if bitFOSSI is installed
	    CX = 444Eh ('DN')
	    DX = 2D46h ('-F')
	    ES = resident code segment
	    ES:DI -> identification data
Program: bitFOSSI is a revision 5 FOSSIL driver for ???'s ISDN board
SeeAlso: AH=2Bh/CX=6269h/DX=7446h,INT 11/AH=BCh
--------D-212C-------------------------------
INT 21 - DOS 1+ - GET SYSTEM TIME
	AH = 2Ch
Return: CH = hour
	CL = minute
	DH = second
	DL = 1/100 seconds
Note:	on most systems, the resolution of the system clock is about 5/100sec,
	  so returned times generally do not increment by 1
	on some systems, DL may always return 00h
SeeAlso: AH=2Ah,AH=2Dh,AH=E7h,INT 1A/AH=00h,INT 1A/AH=02h,INT 1A/AH=FEh
SeeAlso: INT 2F/AX=120Dh
--------v-212C00CX534B-----------------------
INT 21 - SKUDO - INSTALLATION CHECK
	AX = 2C00h
	CX = 534Bh ('SK')
	DX = 5544h ('UD')
	BX = 4F21h ('O!')
Return: AX = 5349h ('SI') if installed
	    CH = version number
	    CL = subversion
Program: SKUDO is an antivirus TSR by Jordi Mas
--------D-212D-------------------------------
INT 21 - DOS 1+ - SET SYSTEM TIME
	AH = 2Dh
	CH = hour
	CL = minute
	DH = second
	DL = 1/100 seconds
Return: AL = result
	    00h successful
	    FFh invalid time, system time unchanged
Note:	DOS 3.3+ also sets CMOS clock
SeeAlso: AH=2Bh"DOS",AH=2Ch,INT 1A/AH=01h,INT 1A/AH=03h,INT 1A/AH=FFh"AT&T"
--------T-212D01CX7820-----------------------
INT 21 - PC-Mix - INSTALLATION CHECK
	AX = 2D01h
	CX = 7820h ('X ')
	DX = 6D69h ('MI')
Return: AL = 00h if installed
--------D-212E--DL00-------------------------
INT 21 - DOS 1+ - SET VERIFY FLAG
	AH = 2Eh
	DL = 00h (DOS 1.x/2.x only)
	AL = new state of verify flag
	    00h off
	    01h on
Notes:	default state at system boot is OFF
	when ON, all disk writes are verified provided the device driver
	  supports read-after-write verification
SeeAlso: AH=54h
--------D-212F-------------------------------
INT 21 - DOS 2+ - GET DISK TRANSFER AREA ADDRESS
	AH = 2Fh
Return: ES:BX -> current DTA
Note:	under the FlashTek X-32 DOS extender, the pointer is in ES:EBX
SeeAlso: AH=1Ah
--------D-2130-------------------------------
INT 21 - DOS 2+ - GET DOS VERSION
	AH = 30h
---DOS 5+ ---
	AL = what to return in BH
	    00h OEM number (as for DOS 2.0-4.0x)
	    01h version flag
Return: AL = major version number (00h if DOS 1.x)
	AH = minor version number
	BL:CX = 24-bit user serial number (most versions do not use this)
---if DOS <5 or AL=00h---
	BH = MS-DOS OEM number (see #0619)
---if DOS 5+ and AL=01h---
	BH = version flag
	    bit 3: DOS is in ROM
	    other: reserved (0)
Notes:	the OS/2 v1.x Compatibility Box returns major version 0Ah (10)
	the OS/2 v2.x Compatibility Box returns major version 14h (20)
	OS/2 Warp 3.0 Virtual DOS Machines report v20.30.
	the Windows/NT DOS box returns version 5.00, subject to SETVER
	DOS 4.01 and 4.02 identify themselves as version 4.00; use
	  INT 21/AH=87h to distinguish between the original European MS-DOS 4.0
	  and the later PC-DOS 4.0x and MS-DOS 4.0x
	IBM DOS 6.1 reports its version as 6.00; use the OEM number to
	  distinguish between MS-DOS 6.00 and IBM DOS 6.1 (there was never an
	  IBM DOS 6.0)
	MS-DOS 6.21 reports its version as 6.20; version 6.22 returns the
	  correct value
	the "Chicago" beta returns version 7.00 (reported in 
	  _Microsoft_Systems_Journal_, August 1994).
	DR-DOS 5.0 and 6.0 report version 3.31; Novell DOS 7 reports IBM v6.00,
	  which some software displays as IBM DOS v6.10 (because of the version
	  mismatch in true IBM DOS, as mentioned above)
	generic MS-DOS 3.30, Compaq MS-DOS 3.31, and others identify themselves
	  as PC-DOS by returning OEM number 00h
	the version returned under DOS 4.0x may be modified by entries in
	  the special program list (see #0874 at AH=52h); the version returned
	  under DOS 5+ may be modified by SETVER--use AX=3306h to get the true
	  version number
SeeAlso: AX=3000h/BX=3000h,AX=3306h,AX=4452h,AH=87h,INT 15/AX=4900h
SeeAlso: INT 2F/AX=122Fh,INT 2F/AX=4010h,INT 2F/AX=E002h

(Table 0619)
Values for DOS OEM number:
 00h	IBM
 01h	Compaq
 02h	MS Packaged Product
 04h	AT&T
 05h	ZDS (Zenith Electronics)
 06h	Hewlett-Packard
 07h	ZDS (Groupe Bull)
 0Dh	Packard-Bell
 16h	DEC
 23h	Olivetti
 28h	Texas Instruments
 29h	Toshiba
 33h	Novell (Windows/386 device IDs only)
 34h	MS Multimedia Systems (Windows/386 device IDs only)
 35h	MS Multimedia Systems (Windows/386 device IDs only)
 4Dh	Hewlett-Packard
 5Eh	RxDOS
 66h	PhysTechSoft (PTS-DOS)
 99h	General Software's Embedded DOS
 EEh	DR-DOS
 EFh	Novell DOS
 FFh	Microsoft, Phoenix
--------E-2130-------------------------------
INT 21 - Phar Lap 386/DOS-Extender, Intel Code Builder - INSTALLATION CHECK
	AH = 30h
	EAX = 00003000h
	EBX = 50484152h ("PHAR")
Return: AL = major DOS version
	AH = minor DOS version
	EAX bits 31-16 = 4458h ('DX') if 386/DOS-extender installed
	    BL = ASCII major version number
	EAX bits 31-16 = 4243h ('BC') if Intel Code Builder installed
	    EDX = address of GDA
SeeAlso: AX=2501h,AX=FF00h,INT 2F/AX=F100h
--------v-2130--DXABCD-----------------------
INT 21 - VIRUS - "Possessed" - INSTALLATION CHECK
	AH = 30h
	DX = ABCDh
Return: DX = DCBAh if installed
SeeAlso: AX=0D20h,AX=30F1h
--------T-213000BX1234-----------------------
INT 21 - CTask 2.0+ - INSTALLATION CHECK
	AX = 3000h
	BX = 1234h
	DS:DX -> 8-byte version string (DX < FFF0h) "CTask21",00h for v2.1-2.2
Return: AL = DOS major version
	AH = DOS minor version
	CX:BX -> Ctask global data block
Program: CTask is a multitasking kernel for C written by Thomas Wagner
Note:	if first eight bytes of returned data block equal eight bytes passed
	  in, CTask is resident
--------O-213000BX3000-----------------------
INT 21 - PC-MOS/386 v3.0 - INSTALLATION CHECK/GET VERSION
	AX = 3000h
	BX = 3000h
	CX = DX = 3000h
Return: AX = PC-MOS version
Program: PC-MOS/386 is a multitasking/multiuser MS-DOS-compatible operating
	  system by The Software Link, Inc.
SeeAlso: AH=30h,INT 38/AH=02h,INT 38/AH=10h
--------G-213022-----------------------------
INT 21 - StopPrg v2.0 - INSTALLATION CHECK
	AX = 3022h
Return: AX = DOS version (see AH=30h)
	CX = 1112h if StopPrg installed
	    BX = segment of resident code
Program: StopPrg is a resident program aborter by MAK-TRAXON's Prophet
Note:	StopPrg may be temporarily disabled by storing 9090h in the word at
	  0000h:04FEh
--------v-2130F1-----------------------------
INT 21 - VIRUS - "Dutch-555"/"Quit 1992" - INSTALLATION CHECK
	AX = 30F1h
Return: AL = 00h if resident
SeeAlso: AH=30h/DX=ABCDh,AX=330Fh
----------2130FFCX4445-----------------------
INT 21 - DESQ??? - INSTALLATION CHECK
	AX = 30FFh
	CX = 4445h ("DE")
	DX = 5351h ("SQ")
Return: BH = 05h if installed
	???
Note:	called by DUBLDISK.COM v2.6; this function is not supported by
	  DESQview, so it may be for DESQview's precursor DESQ.
SeeAlso: AX=4404h"DUBLDISK"
--------D-2131-------------------------------
INT 21 - DOS 2+ - TERMINATE AND STAY RESIDENT
	AH = 31h
	AL = return code
	DX = number of paragraphs to keep resident
Return: never
Notes:	the value in DX only affects the memory block containing the PSP;
	  additional memory allocated via AH=48h is not affected
	the minimum number of paragraphs which will remain resident is 11h
	  for DOS 2.x and 06h for DOS 3+
	most TSRs can save some memory by releasing their environment block
	  before terminating (see #0603 at AH=26h,AH=49h)
SeeAlso: AH=00h,AH=4Ch,AH=4Dh,INT 20,INT 22,INT 27
--------D-2132-------------------------------
INT 21 - DOS 2+ - GET DOS DRIVE PARAMETER BLOCK FOR SPECIFIC DRIVE
	AH = 32h
	DL = drive number (00h = default, 01h = A:, etc)
Return: AL = status
	    00h successful
		DS:BX -> Drive Parameter Block (DPB) (see #0620) for specified
			  drive
	    FFh invalid or network drive
Notes:	the OS/2 compatibility box supports the DOS 3.3 version of this call
	  except for the DWORD at offset 12h
	this call updates the DPB by reading the disk; the DPB may be accessed
	  via the DOS list of lists (see #0840 at AH=52h) if disk access is not
	  desirable.
	undocumented prior to the release of DOS 5.0; only the DOS 4+ version
	  of the DPB has been documented, however
	supported by DR-DOS 3.41+; DR-DOS 3.41-6.0 return the same data as
	  MS-DOS 3.31
SeeAlso: AH=1Fh,AH=52h

Format of DOS Drive Parameter Block:
Offset	Size	Description	(Table 0620)
 00h	BYTE	drive number (00h = A:, 01h = B:, etc)
 01h	BYTE	unit number within device driver
 02h	WORD	bytes per sector
 04h	BYTE	highest sector number within a cluster
 05h	BYTE	shift count to convert clusters into sectors
 06h	WORD	number of reserved sectors at beginning of drive
 08h	BYTE	number of FATs
 09h	WORD	number of root directory entries
 0Bh	WORD	number of first sector containing user data
 0Dh	WORD	highest cluster number (number of data clusters + 1)
		16-bit FAT if greater than 0FF6h, else 12-bit FAT
 0Fh	BYTE	number of sectors per FAT
 10h	WORD	sector number of first directory sector
 12h	DWORD	address of device driver header
 16h	BYTE	media ID byte (see #0581)
 17h	BYTE	00h if disk accessed, FFh if not
 18h	DWORD	pointer to next DPB
---DOS 2.x---
 1Ch	WORD	cluster containing start of current directory, 0000h=root,
		FFFFh = unknown
 1Eh 64 BYTEs	ASCIZ pathname of current directory for drive
---DOS 3.x---
 1Ch	WORD	cluster at which to start search for free space when writing
 1Eh	WORD	number of free clusters on drive, FFFFh = unknown
---DOS 4.0-6.0---
 0Fh	WORD	number of sectors per FAT
 11h	WORD	sector number of first directory sector
 13h	DWORD	address of device driver header
 17h	BYTE	media ID byte (see #0581)
 18h	BYTE	00h if disk accessed, FFh if not
 19h	DWORD	pointer to next DPB
 1Dh	WORD	cluster at which to start search for free space when writing,
		usually the last cluster allocated
 1Fh	WORD	number of free clusters on drive, FFFFh = unknown
SeeAlso: #0875
--------D-2133-------------------------------
INT 21 - DOS 2+ - EXTENDED BREAK CHECKING
	AH = 33h
	AL = subfunction
	    00h get current extended break state
		Return: DL = current state, 00h = off, 01h = on
	    01h set state of extended ^C/^Break checking
		DL = new state
		    00h off, check only on character I/O functions
		    01h on, check on all DOS functions
		Return: (Novell DOS 7) DL = old state of extended Break checks
Note:	under DOS 3.1+ and DR-DOS, this function does not use any of the
	  DOS-internal stacks and may thus be called at any time
SeeAlso: AX=3302h
--------D-213302-----------------------------
INT 21 - DOS 3.x+ internal - GET AND SET EXTENDED CONTROL-BREAK CHECKING STATE
	AX = 3302h
	DL = new state (00h for OFF, 01h for ON)
Return: DL = old state of extended BREAK checking
Notes:	this function does not use any of the DOS-internal stacks and may thus
	  be called at any time; one possible use is modifying Control-Break
	  checking from within an interrupt handler or TSR
	not supported by DR-DOS through version 6.0; newly-supported by
	  Novell DOS 7
SeeAlso: AH=33h
--------D-213303-----------------------------
INT 21 - DOS 4+ - UNUSED
	AX = 3303h
Return: nothing
Note:	this function and AX=3304h were apparently intended to support a
	  code-page switching flag for OS/2 compatibility (OS/2 allows a file
	  to have a code page as an attribute); however, this function has
	  always been a NOP in public releases of DOS.	See _DOS_Internals_
	  Chapter 2 for more information
SeeAlso: AX=3304h
--------D-213304-----------------------------
INT 21 - DOS 4+ - UNUSED
	AX = 3304h
Return: nothing
Note:	this function and AX=3303h were apparently intended to support a
	  code-page switching flag for OS/2 compatibility (OS/2 allows a file
	  to have a code page as an attribute); however, this function has
	  always been a NOP in public releases of DOS.	See _DOS_Internals_
	  Chapter 2 for more information
SeeAlso: AX=3303h
--------D-213305-----------------------------
INT 21 - DOS 4+ - GET BOOT DRIVE
	AX = 3305h
Return: DL = boot drive (1=A:,...)
Notes:	fully reentrant
	NEC 9800-series PCs always call the boot drive A: and assign the other
	  drive letters sequentially to the other drives in the system
	this call is supported by OS/2 Warp 3.0, but not earlier versions of
	  OS/2
--------D-213306-----------------------------
INT 21 - DOS 5+ - GET TRUE VERSION NUMBER
	AX = 3306h
Return: BL = major version
	BH = minor version
	DL = revision (bits 2-0, all others 0)
	DH = version flags
	    bit 3: DOS is in ROM
	    bit 4: DOS is in HMA
	AL = FFh if true DOS version < 5.0
Notes:	this function always returns the true version number, unlike AH=30h,
	  whose return value may be changed with SETVER
	because of the conflict from the CBIS PowerLAN redirector (see next
	  entry), programs should check whether BH is less than 100 (64h)
	  and BL is at least 5 before accepting the returned BX as the true
	  version number; however, even this is not entirely reliable when
	  that redirector is loaded
	fully reentrant
	OS/2 v2.1 will return BX=0A14h (version 20.10)
	the Windows NT DOS box returns BX=3205h (version 5.50)
	Novell DOS 7 returns IBM v6.00, which some software displays as
	  IBM DOS v6.10 (because of the version mismatch in true IBM DOS
	  mentioned for INT 21/AH=30h)
BUG:	DR-DOS 5.0 and 6.0 return CF set/AX=0001h for INT 21/AH=33h
	  subfunctions other than 00h-02h and 05h, while MS-DOS returns AL=FFh
	  for invalid subfunctions
SeeAlso: AH=30h,INT 2F/AX=122Fh
--------N-213306-----------------------------
INT 21 - CBIS POWERLAN - NETWORK REDIRECTOR - ???
	AX = 3306h
Return: AX = 3306h
	BL = ??? (usually 00h)
	BH = ??? (usually 00h or FFh)
Note:	unknown function, is in conflict with DOS 5+ version call
SeeAlso: AX=3306h"DOS"
--------v-21330F-----------------------------
INT 21 - VIRUS - "Burghofer" - INSTALLATION CHECK
	AX = 330Fh
Return: AL = 0Fh if resident (DOS returns AL=FFh)
SeeAlso: AX=30F1h,AX=33E0h
--------k-213341-----------------------------
INT 21 - Diet Disk v1.0 - INSTALLATION CHECK
	AX = 3341h
Return: DX = 1234h if installed
	    CX = resident code segment
Program: Diet Disk is a public domain transparent data file compressor by
	  Barry Nance
--------v-2133E0-----------------------------
INT 21 - VIRUS - "Oropax" - INSTALLATION CHECK
	AX = 33E0h
Return: AL = E0h if resident (DOS returns AL=FFh)
SeeAlso: AX=330Fh,AX=357Fh
--------D-2134-------------------------------
INT 21 - DOS 2+ - GET ADDRESS OF INDOS FLAG
	AH = 34h
Return: ES:BX -> one-byte InDOS flag
Notes:	this function executes on the DOS stack, and thus cannot be called
	  while another DOS function is already executing; you should use
	  this function once at the beginning of the program and store the
	  returned pointer rather than calling it when requiring DOS access
	the value of InDOS is incremented whenever an INT 21 function begins
	  and decremented whenever one completes
	during an INT 28 call, it is safe to call some INT 21 functions even
	  though InDOS may be 01h instead of zero
	InDOS alone is not sufficient for determining when it is safe to
	  enter DOS, as the critical error handling decrements InDOS and
	  increments the critical error flag for the duration of the critical
	  error.  Thus, it is possible for InDOS to be zero even if DOS is
	  busy.
	SMARTDRV 4.0 sets the InDOS flag while flushing its buffers to disk,
	  then zeros it on completion
	the critical error flag is the byte immediately following InDOS in
	  DOS 2.x, and the byte BEFORE the InDOS flag in DOS 3+ and
	  DR-DOS 3.41+ (except COMPAQ DOS 3.0, where the critical error flag
	  is located 1AAh bytes BEFORE the critical section flag)
	for DOS 3.1+, an undocumented call exists to get the address of the
	  critical error flag (see AX=5D06h)
	this function was undocumented prior to the release of DOS 5.0.
SeeAlso: AX=5D06h,AX=5D0Bh,INT 15/AX=DE1Fh,INT 28
--------D-2135-------------------------------
INT 21 - DOS 2+ - GET INTERRUPT VECTOR
	AH = 35h
	AL = interrupt number
Return: ES:BX -> current interrupt handler
Note:	under DR-DOS 5.0+, this function does not use any of the DOS-internal
	  stacks and may thus be called at any time
SeeAlso: AH=25h,AX=2503h
--------E-213501-----------------------------
INT 21 P - FlashTek X-32VM - ALLOCATE PROTECTED-MODE SELECTOR
	AX = 3501h
Return: CF clear if successful
	    BX = new selector
	CF set on error (no more selectors available)
Note:	the new selector will be an expand-up read/write data selector with
	  undefined base and limit
SeeAlso: AX=3502h,INT 31/AX=0000h
--------E-213502-----------------------------
INT 21 P - FlashTek X-32VM - DEALLOCATE PROTECTED-MODE SELECTOR
	AX = 3502h
	BX = selector
Return: CF clear if successful
	CF set on error (invalid selector)
Note:	only selectors allocated via AX=3501h should be deallocated
SeeAlso: AX=3501h,INT 31/AX=0001h
--------E-213503-----------------------------
INT 21 P - FlashTek X-32VM - SET SELECTOR BASE ADDRESS
	AX = 3503h
	BX = selector
	ECX = base address
Return: CF clear if successful
	CF set on error (invalid selector)
SeeAlso: AX=3504h,AX=3505h,INT 31/AX=0007h
--------E-213504-----------------------------
INT 21 P - FlashTek X-32VM - GET SELECTOR BASE ADDRESS
	AX = 3504h
	BX = selector
Return: CF clear if successful
	    ECX = absolute base address of selector
	CF set on error (invalid selector)
SeeAlso: AX=3503h,INT 31/AX=0006h
--------E-213505-----------------------------
INT 21 P - FlashTek X-32VM - SET SELECTOR LIMIT
	AX = 3505h
	BX = selector
	ECX = desired limit
Return: CF clear if successful
	    ECX = actual limit set
	CF set on error (no more selectors available)
Note:	the limit will be rounded down to nearest 4K boundary if the requested
	  limit is greater than 1MB
SeeAlso: AX=3503h,INT 31/AX=0008h
--------E-21350A-----------------------------
INT 21 P - FlashTek X-32VM - PHYSICAL ADDRESS MAPPING
	AX = 350Ah
	EBX = absolute physical address
	ECX = size in bytes of area to map
Return: CF clear if successful
	CF set on error (insufficient memory or service refused by DPMI host)
Notes:	should not make repeated calls for the same physical address
	there is no provision for unmapping memory
--------E-21350B-----------------------------
INT 21 P - FlashTek X-32VM - UPDATE AND RETURN AVAILABLE FREE MEMORY
	AX = 350Bh
	DS = default selector for DS
Return: CF clear
	EAX = maximum amount of memory which can be allocated via AX=350Ch
SeeAlso: AX=350Ch
--------E-21350C-----------------------------
INT 21 P - FlashTek X-32VM - ALLOCATE A BLOCK OF MEMORY
	AX = 350Ch
	ECX = size of block in bytes
	DS = default DS
Return: CF clear if successful
	    EAX = near pointer to new block
	    EDX = new lowest legal value for stack
	CF set on error (requested size not multiple of 4K)
SeeAlso: AX=350Bh,AX=350Dh
--------E-21350D-----------------------------
INT 21 P - FlashTek X-32VM - RESERVE BLOCK OF MEMORY FOR 32-BIT STACK
	AX = 350Dh
	EBX = current ESP value
	ECX = size of block in bytes
	DS = default DS
Return: CF clear if successful
	    EBX = new value for ESP
	    EDX = suggested new limit for SS
	CF set on error
Note:	this function should only be called once during initialization
SeeAlso: AX=350Bh,AX=350Ch
--------v-21357F-----------------------------
INT 21 - VIRUS - "Agiplan"/"Month 4-6" - INSTALLATION CHECK
	AX = 357Fh
Return: DX = FFFFh if installed
SeeAlso: AX=33E0h,AX=3DFFh
--------D-2136-------------------------------
INT 21 - DOS 2+ - GET FREE DISK SPACE
	AH = 36h
	DL = drive number (00h = default, 01h = A:, etc)
Return: AX = FFFFh if invalid drive
	else
	    AX = sectors per cluster
	    BX = number of free clusters
	    CX = bytes per sector
	    DX = total clusters on drive
Notes:	free space on drive in bytes is AX * BX * CX
	total space on drive in bytes is AX * CX * DX
	"lost clusters" are considered to be in use
	according to Dave Williams' MS-DOS reference, the value in DX is
	  incorrect for non-default drives after ASSIGN is run
SeeAlso: AH=1Bh,AH=1Ch
--------D-213700-----------------------------
INT 21 - DOS 2+ - "SWITCHAR" - GET SWITCH CHARACTER
	AX = 3700h
Return: AL = status
	    00h successful
		DL = current switch character
	    FFh unsupported subfunction
Desc:	Determine the character which is used to introduce command switches.
	  This setting is ignored by DOS commands in version 4.0 and higher,
	  but is honored by many third-party programs.
Notes:	documented in some OEM versions of some releases of DOS
	supported by OS/2 compatibility box
	always returns AL=00h/DL=2Fh for MS-DOS 5+ and DR-DOS 3.41+
SeeAlso: AX=3701h
--------D-213701-----------------------------
INT 21 - DOS 2+ - "SWITCHAR" - SET SWITCH CHARACTER
	AX = 3701h
	DL = new switch character
Return: AL = status
	    00h successful
	    FFh unsupported subfunction
Notes:	documented in some OEM versions of some releases of DOS
	supported by OS/2 compatibility box
	ignored by MS-DOS 5+ and DR-DOS 3.41+; DR-DOS 6.0 leaves AX unchanged
SeeAlso: AX=3700h
--------D-2137-------------------------------
INT 21 - DOS 2.x and 3.3+ only - "AVAILDEV" - SPECIFY \DEV\ PREFIX USE
	AH = 37h
	AL = subfunction
	    02h get availdev flag
		Return: DL = 00h \DEV\ must precede character device names
			   = nonzero \DEV\ is optional
	    03h set availdev flag
		DL = 00h	\DEV\ is mandatory
		   = nonzero	\DEV\ is optional
Return: AL = status
	    00h successful
	    FFh unsupported subfunction
Notes:	all versions of DOS from 2.00 allow \DEV\ to be prepended to device
	  names without generating an error even if the directory \DEV does
	  not actually exist (other paths generate an error if they do not
	  exist).
	although MS-DOS 3.3+ and DR-DOS 3.41+ accept these calls, they have no
	  effect, and AL=02h always returns DL=FFh
--------k-2137D0BX899D-----------------------
INT 21 - DIET v1.43e - TSR INSTALLATION CHECK
	AX = 37D0h
	BX = 899Dh ('DI' + 'ET')
Return: AL = FFh if not present as TSR (default return value from DOS)
	AX = 0000h if installed as a TSR
	    CX = 899Dh
	    DX = version ID
Program: DIET is a transparent file copressor/decompressor by Teddy Matsumoto
SeeAlso: AX=37D1h,AX=37D2h,AX=37D4h,AX=37D6h,AX=37DFh,AX=4BF0h,AX=4BF1h
--------k-2137D1BX899D-----------------------
INT 21 - DIET v1.43e - GET DIET.EXE RESIDENT SEGMENT
	AX = 37D1h
	BX = 899Dh ('DI' + 'ET')
Return: AX = 0000h
	CX = code segment of TSR part of DIET.EXE
	DX = memory block segment of TSR DIET.EXE
		(0000h if installed as device driver)
SeeAlso: AX=37D0h,AX=37DFh
--------k-2137D2BX899D-----------------------
INT 21 - DIET v1.43e - GET TSR CONTROL FLAGS
	AX = 37D2h
	BX = 899Dh ('DI' + 'ET')
Return: AX = 0000h
	DL = control flag (00h active, else disabled)
	DH = skip flag (nonzero while TSR active)
SeeAlso: AX=37D0h,AX=37D3h,AX=37D4h
--------k-2137D3BX899D-----------------------
INT 21 - DIET v1.43e - SET TSR CONTROL FLAGS
	AX = 37D3h
	BX = 899Dh ('DI' + 'ET')
	DL = control flag (00h active, else disabled)
	DH = skip flag (00h)
Return: AX = 0000h
SeeAlso: AX=37D0h,AX=37D2h,AX=37D5h
--------k-2137D4BX899D-----------------------
INT 21 - DIET v1.43e - GET TSR OPTIONS
	AX = 37D4h
	BX = 899Dh ('DI' + 'ET')
Return: AX = 0000h
	DX = TSR options (see #0621)
SeeAlso: AX=37D0h,AX=37D2h,AX=37D5h

Bitfields for DIET TSR options:
Bit(s)	Description	(Table 0621)
 0	automated compression of DIETed file
 1	automated compression of newly-created file
 2	suppress DIET message
 3	display original file size
 4-15	reserved (0)
--------k-2137D5BX899D-----------------------
INT 21 - DIET v1.43e - SET TSR OPTIONS
	AX = 37D5h
	BX = 899Dh ('DI' + 'ET')
	DX = TSR options (see #0621)
Return: AX = 0000h
Program: DIET is a transparent file copressor/decompressor by Teddy Matsumoto
SeeAlso: AX=37D0h,AX=37D3h,AX=37D4h
--------k-2137D6BX899D-----------------------
INT 21 - DIET v1.43e - GET TEMPORARY DIRECTORY NAMES
	AX = 37D6h
	BX = 899Dh ('DI' + 'ET')
Return: AX = 0000h
	DS:DX -> name of temporary directory or 0000h:0000h for current dir
SeeAlso: AX=37D0h,AX=37D7h
--------k-2137D7BX899D-----------------------
INT 21 - DIET v1.43e - SET TEMPORARY DIRECTORY NAMES
	AX = 37D7h
	BX = 899Dh ('DI' + 'ET')
	DS:DX -> ASCIZ name of temporary directory (max 61 chars)
		0000h:0000h for current directory
Return: AX = 0000h
Note:	the specified directory name must include a drive letter and end with
	  a backslash
SeeAlso: AX=37D0h,AX=37D6h
--------k-2137DCBX899D-----------------------
INT 21 - DIET v1.43e - SET ADDRESS OF EXTERNAL PROCEDURE
	AX = 37DCh
	BX = 899Dh ('DI' + 'ET')
	DS:DX -> external procedure (see #0622)
Return: AX = 0000h
Note:	the resident code will call the specified external procedure at the
	  beginning of decompression and when compression is exited on failure
SeeAlso: AX=37DDh

(Table 0622)
Values DIET external procedure is called with:
	STACK:	WORD	class
			FFFDh creation failed for unknown reasons
			FFFEh creation failed due to lack of space
			FFFFh file creation error
			else file handle of DIETed file to be decompressed
		DWORD	-> compressed filename
		DWORD	-> decompressed or temporary filename
Return: SI,DI,BP,DS,ES must be preserved by external procedure
--------k-2137DDBX899D-----------------------
INT 21 - DIET v1.43e - RELEASE EXTERNAL PROCEDURE
	AX = 37DDh
	BX = 899Dh ('DI' + 'ET')
Program: DIET is a transparent file copressor/decompressor by Teddy Matsumoto
Note:	unlinks the external procedure specified by AX=37DCh
SeeAlso: AX=37DCh
--------k-2137DEBX899D-----------------------
INT 21 - DIET v1.43e - READ EMS STATUS
	AX = 37DEh
	BX = 899Dh ('DI' + 'ET')
Return: AX = 0000h
	CX = EMS status
	    0000h not used
	    0001h used as work area
	    0002h used for code and as work area
	DX = EMM handle when EMS is in use
--------k-2137DFBX899D-----------------------
INT 21 - DIET v1.43e - UNLOAD TSR
	AX = 37DFh
	BX = 899Dh ('DI' + 'ET')
Return: AX = status
	    0000h successful
	    00FFh failed
Program: DIET is a transparent file copressor/decompressor by Teddy Matsumoto
SeeAlso: AX=37D0h
Index:	uninstall;DIET
--------D-2138-------------------------------
INT 21 - DOS 2+ - GET COUNTRY-SPECIFIC INFORMATION
	AH = 38h
--DOS 2.x--
	AL = 00h get current-country info
	DS:DX -> buffer for returned info (see #0623,#0624)
Return: CF set on error
	    AX = error code (02h)
	CF clear if successful
	    AX = country code (MS-DOS 2.11 only)
	    buffer at DS:DX filled
--DOS 3+--
	AL = 00h for current country
	AL = 01h thru 0FEh for specific country with code <255 (see #0625)
	AL = 0FFh for specific country with code >= 255
	   BX = 16-bit country code (see #0625)
	DS:DX -> buffer for returned info (see #0624)
Return: CF set on error
	    AX = error code (02h)
	CF clear if successful
	    AX = country code (Novell NWDOS v7.0)
	    BX = country code
	    DS:DX buffer filled
Note:	this function is not supported by the Borland DPMI host, but no error
	  is returned; as a workaround, one should allocate a buffer in
	  conventional memory with INT 31/AX=0100h and simulate an INT 21 with
	  INT 31/AX=0300h
SeeAlso: AH=65h,INT 10/AX=5001h,INT 2F/AX=110Ch,INT 2F/AX=1404h

Format of DOS 2.00-2.10 country info:
Offset	Size	Description	(Table 0623)
 00h	WORD	date format  0 = USA	mm dd yy
			     1 = Europe dd mm yy
			     2 = Japan	yy mm dd
 02h	BYTE	currency symbol
 03h	BYTE	00h
 04h	BYTE	thousands separator char
 05h	BYTE	00h
 06h	BYTE	decimal separator char
 07h	BYTE	00h
 08h 24 BYTEs	reserved

Format of DOS 2.11+ country info:
Offset	Size	Description	(Table 0624)
 00h	WORD	date format (see #0623)
 02h  5 BYTEs	ASCIZ currency symbol string
 07h  2 BYTEs	ASCIZ thousands separator
 09h  2 BYTEs	ASCIZ decimal separator
 0Bh  2 BYTEs	ASCIZ date separator
 0Dh  2 BYTEs	ASCIZ time separator
 0Fh	BYTE	currency format
		bit 2 = set if currency symbol replaces decimal point
		bit 1 = number of spaces between value and currency symbol
		bit 0 = 0 if currency symbol precedes value
			1 if currency symbol follows value
 10h	BYTE	number of digits after decimal in currency
 11h	BYTE	time format
		bit 0 = 0 if 12-hour clock
			1 if 24-hour clock
 12h	DWORD	address of case map routine
		(FAR CALL, AL = character to map to upper case [>= 80h])
 16h  2 BYTEs	ASCIZ data-list separator
 18h 10 BYTEs	reserved

(Table 0625)
Values for country code:
 001h	United States
 002h	Canadian-French
 003h	Latin America
 01Fh	Netherlands
 020h	Belgium
 021h	France
 022h	Spain
 024h	Hungary (not supported by DR-DOS 5.0)
 026h	Yugoslavia (not supported by DR-DOS 5.0)
 027h	Italy
 029h	Switzerland
 02Ah	Czechoslovakia/Tjekia (not supported by DR-DOS 5.0)
 02Bh	Austria (DR-DOS 5.0)
 02Ch	United Kingdom
 02Dh	Denmark
 02Eh	Sweden
 02Fh	Norway
 030h	Poland (not supported by DR-DOS 5.0)
 031h	Germany
 037h	Brazil (not supported by DR-DOS 5.0)
 03Dh	International English [Australia in DR-DOS 5.0]
 051h	Japan (DR-DOS 5.0, MS-DOS 5.0+)
 052h	Korea (DR-DOS 5.0)
 056h	China (MS-DOS 5.0+)
 058h	Taiwan (MS-DOS 5.0+)
 05Ah	Turkey (MS-DOS 5.0+)
 15Fh	Portugal
 162h	Iceland
 166h	Finland
 311h	Middle East/Saudi Arabia (DR-DOS 5.0,MS-DOS 5.0+)
 3CCh	Israel (DR-DOS 5.0,MS-DOS 5.0+)
--------D-2138--DXFFFF-----------------------
INT 21 - DOS 3+ - SET COUNTRY CODE
	AH = 38h
	DX = FFFFh
	AL = 01h thru FEh for specific country with code <255
	AL = FFh for specific country with code >= 255
	   BX = 16-bit country code (see #0625)
Return: CF set on error
	    AX = error code (see #0885 at AH=59h)
	CF clear if successful
Note:	not supported by OS/2
SeeAlso: INT 2F/AX=1403h
--------D-2139-------------------------------
INT 21 - DOS 2+ - "MKDIR" - CREATE SUBDIRECTORY
	AH = 39h
	DS:DX -> ASCIZ pathname
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (03h,05h) (see #0885 at AH=59h)
Notes:	all directories in the given path except the last must exist
	fails if the parent directory is the root and is full
	DOS 2.x-3.3 allow the creation of a directory sufficiently deep that
	  it is not possible to make that directory the current directory
	  because the path would exceed 64 characters
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=3Ah,AH=3Bh,AH=6Dh,AH=71h,AH=E2h/SF=0Ah,INT 2F/AX=1103h
SeeAlso: INT 60/DI=0511h
--------D-213A-------------------------------
INT 21 - DOS 2+ - "RMDIR" - REMOVE SUBDIRECTORY
	AH = 3Ah
	DS:DX -> ASCIZ pathname of directory to be removed
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (03h,05h,06h,10h) (see #0885 at AH=59h)
Notes:	directory must be empty (contain only '.' and '..' entries)
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=39h,AH=3Bh,AH=71h,AH=E2h/SF=0Bh,INT 2F/AX=1101h,INT 60/DI=0512h
--------D-213B-------------------------------
INT 21 - DOS 2+ - "CHDIR" - SET CURRENT DIRECTORY
	AH = 3Bh
	DS:DX -> ASCIZ pathname to become current directory (max 64 bytes)
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (03h) (see #0885 at AH=59h)
Notes:	if new directory name includes a drive letter, the default drive is
	  not changed, only the current directory on that drive
	changing the current directory also changes the directory in which
	  FCB file calls operate
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=47h,AH=71h,INT 2F/AX=1105h
--------D-213C-------------------------------
INT 21 - DOS 2+ - "CREAT" - CREATE OR TRUNCATE FILE
	AH = 3Ch
	CX = file attributes (see #0626)
	DS:DX -> ASCIZ filename
Return: CF clear if successful
	    AX = file handle
	CF set on error
	    AX = error code (03h,04h,05h) (see #0885 at AH=59h)
Notes:	if a file with the given name exists, it is truncated to zero length
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
	DR-DOS checks the system password or explicitly supplied password at
	  the end of the filename against the reserved field in the directory
	  entry before allowing access
SeeAlso: AH=16h,AH=3Dh,AH=5Ah,AH=5Bh,AH=93h,INT 2F/AX=1117h

Bitfields for file attributes:
Bit(s)	Description	(Table 0626)
 0	read-only
 1	hidden
 2	system
 3	volume label (ignored)
 4	reserved, must be zero (directory)
 5	archive bit
 7	if set, file is shareable under Novell NetWare
--------D-213D-------------------------------
INT 21 - DOS 2+ - "OPEN" - OPEN EXISTING FILE
	AH = 3Dh
	AL = access and sharing modes (see #0627)
	DS:DX -> ASCIZ filename
	CL = attribute mask of files to look for (server call only)
Return: CF clear if successful
	    AX = file handle
	CF set on error
	    AX = error code (01h,02h,03h,04h,05h,0Ch,56h) (see #0885 at AH=59h)
Notes:	file pointer is set to start of file
	file handles which are inherited from a parent also inherit sharing
	  and access restrictions
	files may be opened even if given the hidden or system attributes
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
	DR-DOS checks the system password or explicitly supplied password at
	  the end of the filename against the reserved field in the directory
	  entry before allowing access
	sharing modes are only effective on local drives if SHARE is loaded
SeeAlso: AH=0Fh,AH=3Ch,AX=4301h,AX=5D00h,INT 2F/AX=1116h,INT 2F/AX=1226h

Bitfields for access and sharing modes:
Bit(s)	Description	(Table 0627)
 2-0	access mode
	000 read only
	001 write only
	010 read/write
	011 (DOS 5+ internal) passed to redirector on EXEC to allow
		case-sensitive filenames
 3	reserved (0)
 6-4	sharing mode (DOS 3+) (see #0628)
	000 compatibility mode
	001 "DENYALL" prohiboth read and write access by others
	010 "DENYWRITE" prohiwrite access by others
	011 "DENYREAD" prohiread access by others
	100 "DENYNONE" allow full access by others
	111 network FCB (only available during server call)
 7	inheritance
	if set, file is private to current process and will not be inherited
	  by child processes

(Table 0628)
Values of DOS file sharing behavior:
	  |	Second and subsequent Opens
 First	  |Compat  Deny	  Deny	 Deny	Deny
 Open	  |	   All	  Write	 Read	None
	  |R W RW R W RW R W RW R W RW R W RW
 - - - - -| - - - - - - - - - - - - - - - - -
 Compat R |Y Y Y  N N N	 1 N N	N N N  1 N N
	W |Y Y Y  N N N	 N N N	N N N  N N N
	RW|Y Y Y  N N N	 N N N	N N N  N N N
 - - - - -|
 Deny	R |C C C  N N N	 N N N	N N N  N N N
 All	W |C C C  N N N	 N N N	N N N  N N N
	RW|C C C  N N N	 N N N	N N N  N N N
 - - - - -|
 Deny	R |2 C C  N N N	 Y N N	N N N  Y N N
 Write	W |C C C  N N N	 N N N	Y N N  Y N N
	RW|C C C  N N N	 N N N	N N N  Y N N
 - - - - -|
 Deny	R |C C C  N N N	 N Y N	N N N  N Y N
 Read	W |C C C  N N N	 N N N	N Y N  N Y N
	RW|C C C  N N N	 N N N	N N N  N Y N
 - - - - -|
 Deny	R |2 C C  N N N	 Y Y Y	N N N  Y Y Y
 None	W |C C C  N N N	 N N N	Y Y Y  Y Y Y
	RW|C C C  N N N	 N N N	N N N  Y Y Y
Legend: Y = open succeeds, N = open fails with error code 05h
	C = open fails, INT 24 generated
	1 = open succeeds if file read-only, else fails with error code
	2 = open succeeds if file read-only, else fails with INT 24
SeeAlso: #0848
--------v-213DFF-----------------------------
INT 21 - VIRUS - "JD-448" - INSTALLATION CHECK
	AX = 3DFFh
Return: AX = 4A44h if resident
SeeAlso: AX=357Fh,AX=4203h
--------D-213E-------------------------------
INT 21 - DOS 2+ - "CLOSE" - CLOSE FILE
	AH = 3Eh
	BX = file handle
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (06h) (see #0885 at AH=59h)
Note:	if the file was written to, any pending disk writes are performed, the
	  time and date stamps are set to the current time, and the directory
	  entry is updated
SeeAlso: AH=10h,AH=3Ch,AH=3Dh,INT 2F/AX=1106h,INT 2F/AX=1227h
--------D-213F-------------------------------
INT 21 - DOS 2+ - "READ" - READ FROM FILE OR DEVICE
	AH = 3Fh
	BX = file handle
	CX = number of bytes to read
	DS:DX -> buffer for data
Return: CF clear if successful
	    AX = number of bytes actually read (0 if at EOF before call)
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Notes:	data is read beginning at current file position, and the file position
	  is updated after a successful read
	the returned AX may be smaller than the request in CX if a partial
	  read occurred
	if reading from CON, read stops at first CR
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
BUG:	Novell NETX.EXE v3.26 and 3.31 do not set CF if the read fails due to
	  a record lock (see AH=5Ch), though it does return AX=0005h; this
	  has been documented by Novell
SeeAlso: AH=27h,AH=40h,AH=93h,INT 2F/AX=1108h,INT 2F/AX=1229h
--------G-213F-------------------------------
INT 21 - Turbo Debug HARDWARE BREAKPOINTS - READ STATUS BLOCK
	AH = 3Fh
	BX = handle for character device "TDHDEBUG"
	CX = number of bytes to read
	DS:DX -> buffer for status block (see #0630)
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
SeeAlso: AH=40h"Turbo Debug"

(Table 0629)
Values for status of Turbo Debugger command:
 00h	successful
 01h	invalid handle
 02h	no more breakpoints available
 03h	hardware does not support specified breakpoint type
 04h	previous command prevents execution
 05h	debugger hardware not found
 06h	hardware failure
 07h	invalid command
 08h	driver not initialized yet
 FEh	recursive entry (hardware breakpoint inside hw bp handler)

Format of Turbo Debugger status block:
Offset	Size	Description	(Table 0630)
 00h	BYTE	status of command (see #0629)
---status for command 01h---
 01h	WORD	device driver interface version number (currently 1)
 03h	WORD	device driver software version
 05h	BYTE	maximum simultaneous hardware breakpoints
 06h	BYTE	configuration bits (see #0631)
 07h	BYTE	supported breakpoint types (see #0632)
 08h	WORD	supported addressing match modes (see #0633)
 0Ah	WORD	supported data matches (see #0634)
 0Ch	BYTE	maximum data match length (01h, 02h, or 04h)
 0Dh	WORD	size of onboard memory (in KB)
 0Fh	WORD	maximum number of trace-back events
 11h	WORD	hardware breakpoint enable byte address segment (0000h if not
		  supported)
---status for command 04h---
 01h	BYTE	handle to use when referring to the just-set breakpoint

Bitfields for Turbo Debugger configuration bits:
Bit(s)	Description	(Table 0631)
 0	CPU and DMA accesses are distinct
 1	can detect DMA transfers
 2	supports data mask
 3	hardware pass counter on breakpoints
 4	can match on data as well as addresses

Bitfields for Turbo Debugger supported breakpoint types:
Bit(s)	Description	(Table 0632)
 0	memory read
 1	memory write
 2	memory read/write
 3	I/O read
 4	I/O write
 5	I/O read/write
 6	instruction fetch

Bitfields for Turbo Debugger supported addressing match modes:
Bit(s)	Description	(Table 0633)
 0	any address
 1	equal to test value
 2	not equal
 3	above test value
 4	below test value
 5	below or equal
 6	above or equal
 7	within range
 8	outside range

Bitfields for Turbo Debugger supported data matches:
Bit(s)	Description	(Table 0634)
 0	any data
 1	equal to test value
 2	not equal
 3	above test value
 4	below test value
 5	below or equal
 6	above or equal
 7	within range
 8	outside range
--------N-213F-------------------------------
INT 21 - PC/TCP IPCUST.SYS - READ CONFIGURATION DATA
	AH = 3Fh
	BX = handle for character device "$IPCUST"
	CX = number of bytes to read
	DS:DX -> buffer for configuration data (see #0635)
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Notes:	if less than the entire data is read or written, the next read/write
	  continues where the previous one ended; IOCTL calls AX=4402h and
	  AX=4403h both reset the location at which the next operation starts
	  to zero
	the data pointer is also reset to zero if the previous read or write
	  reached or exceeded the end of the data, when the current function
	  is read and the previous was write, or vice versa
	v2.1+ uses a new configuration method, but allows the installation
	  of IPCUST.SYS for backward compatibility with other software which
	  must read the PC/TCP configuration
SeeAlso: AH=40h"IPCUST",AX=4402h"IPCUST",AX=4402h"FTPSOFT"

Format of PC/TCP configuration data:
Offset	Size	Description	(Table 0635)
 00h 12 BYTEs	IPCUST.SYS device driver header
 12h	BYTE	???
 13h	BYTE	???
 14h	WORD	???
 16h	BYTE	bit flags
		bit 0: send BS rather than DEL for BackSpace key
		bit 1: wrap long lines
 17h	BYTE	???
 18h 64 BYTEs	ASCIZ hostname
 58h 64 BYTEs	ASCIZ domain name
		(fully qualified domain name is hostname.domain-name)
 98h 16 BYTEs	ASCIZ username
 A8h 64 BYTEs	ASCIZ full name
 E8h 64 BYTEs	ASCIZ office address
128h 32 BYTEs	ASCIZ phone number
148h	WORD	offset from GMT in minutes
14Ah  4 BYTEs	ASCIZ timezone name
14Eh	WORD	number of time servers
150h  ? DWORDs	(big-endian) IP addresses for time servers
	???
164h	WORD	number of old-style name servers
166h  3 DWORDs	(big-endian) IP addresses for name servers
172h	WORD	number of domain name servers
174h  3 DWORDs	(big-endian) IP addresses for domain name servers
180h	DWORD	(big-endian) IP address of default gateway
184h	DWORD	(big-endian) IP address of log server
188h	DWORD	(big-endian) IP address of cookie server
18Ch	DWORD	(big-endian) IP address of lpr server
190h	DWORD	(big-endian) IP address of imagen print server
194h 54 BYTEs	???
1E8h	WORD	TCP default window size in bytes
1EAh	WORD	TCP low window size
1ECh 64 BYTEs	ASCIZ host tabel filename
22Ch  2 BYTEs	???
22Eh 80 BYTEs	ASCIZ mail relay host name
27Eh	BYTE	???
27Fh	BYTE	??? bit flags
280h 44 BYTEs	???
2ACh	WORD	???
2AEh 202 BYTEs	???
--------N-213F-------------------------------
INT 21 - WORKGRP.SYS - GET ENTRY POINT
	AH = 3Fh
	BX = file handle for device "NET$HLP$"
	CX = 0008h
	DS:DX -> buffer for entry point record (see #0705)
Return: CF clear if successful
	    AX = number of bytes actually read (0 if at EOF before call)
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Program: WORKGRP.SYS is the portion of Microsoft's Workgroup Connection which
	  permits communication with PCs running Windows for Workgroups or
	  LAN Manager
SeeAlso: AX=4402h"WORKGRP.SYS",INT 2F/AX=9400h
--------N-213F-------------------------------
INT 21 - BW-TCP - GET DRIVER INFO
	AH = 3Fh
	BX = file handle for device "ETHDEV27"
	CX = 002Bh
	DS:DX -> buffer for driver info (see #0636)
Return: CF clear if successful
	    AX = number of bytes actually read (0 if at EOF before call)
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Program: BW-TCP is a TCP/IP protocol stack by Beame & Whiteside Software
Notes:	the B&W socket library performs an INT 21/AX=4401h with DX=0060h before
	  making this call to retrieve the driver information; one should also
	  call the private API interrupt with AH=15h
	the installation check for the TCP/IP stack is to test for the
	  existence of the character device UDP-IP10
SeeAlso: INT 14/AH=56h,INT 62/AH=00h"ETHDEV",INT 63/AH=03h,INT 64/AH=00h
Index:	installation check;BW-TCP hardware driver
Index:	installation check;BW-TCP TCPIP.SYS

Format of BW-TCP driver info:
Offset	Size	Description	(Table 0636)
 00h	WORD	I/O base address
 02h	BYTE	shared memory page (01h = segment 0100h, etc.)
 03h	BYTE	interrupt vector for private API
 04h	BYTE	IRQ used by board
 05h	WORD	size of data buffer
 07h	WORD	maximum transfer window
 09h	WORD	time zone
 0Bh	BYTE	address type (01h user, 04h RARP, 05h BOOTP)
 0Ch	DWORD	internet address
 10h	WORD	"value" ???
 12h	BYTE	subnet mask
 13h	WORD	"ether_pointer" ???
 15h	WORD	offset in device driver of log server records (see #0637)
 17h	WORD	offset in device driver of name server records (see #0637)
 19h	WORD	offset in device driver of print server records (see #0637)
 1Bh	WORD	offset in device driver of time server records (see #0637)
 1Dh	WORD	offset in device driver of gateway records (see #0637)
 1Fh	WORD	segment address of device driver
 21h	BYTE	transfer size
 22h  9 BYTEs	network adapter board name
---11/21/91+ ---
 23h	BYTE	ETHDEV version (major in high nybble, minor in low nybble)
 24h	BYTE	ETHDEV revision
 25h	BYTE	TCPIP version (major in high nybble, minor in low nybble)
 26h	BYTE	TCPIP revision
 27h	BYTE	BWRPC version (major in high nybble, minor in low nybble)
 28h	BYTE	BWRPC revision
 29h	BYTE	BWNFS version (major in high nybble, minor in low nybble)
 2Ah	BYTE	BWNFS revision
 2Bh	BYTE	Telnet version (major in high nybble, minor in low nybble)
 2Ch	BYTE	Telnet revision
 2Dh	BYTE	NETBIOS version (major in high nybble, minor in low nybble)
 2Eh	BYTE	NETBIOS revision
Note:	for each driver, if version=0, the driver is not installed or does
	  not support the version check

Format of BW-TCP server records:
Offset	Size	Description	(Table 0637)
 00h	BYTE	number of server records following
 01h  N DWORDs	internet addresses of servers
--------y-213F-------------------------------
INT 21 - Trusted Access - NB.SYS - GET STATE
	AH = 3Fh
	BX = file handle for device "$$NB$$NB"
	CX = 0002h (size of state)
	DS:DX -> buffer for state record (see #0638)
Return: CF clear if successful
	    AX = number of bytes actually read (0 if at EOF before call)
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Program: Trusted Access is a security and access-control package by Lassen
	  Software, Inc.; NB.SYS is a device driver to prevent the user from
	  terminating CONFIG.SYS or AUTOEXEC.BAT with Ctrl-Break
SeeAlso: AH=40h"NB.SYS",AX=4101h

Format of Trusted Access state record:
Offset	Size	Description	(Table 0638)
 00h	BYTE	00h off, 01h on
 01h	BYTE	keys being disabled
		bit 0: Ctrl-Break
		bit 1: SysReq
		bit 2: Ctrl and Alt
		bit 3: Ctrl-Alt-Del
		bit 7: all keys (overrides other bits)
----------213F-------------------------------
INT 21 U - IFSHLP.SYS - GET ENTRY POINT
	AH = 3Fh
	BX = file handle for device "IFS$HLP$"
	CX = 0008h (size of buffer in bytes)
	DS:DX -> buffer for entry point record (see #0639)
Return: CF clear if successful
	    AX = number of bytes actually read (0 if at EOF before call)
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Program: IFSHLP.SYS is a support driver for Microsoft Windows for Workgroups
SeeAlso: AX=4402h"IFSHLP"

Format of IFSHLP.SYS entry point record:
Offset	Size	Description	(Table 0639)
 00h  4 BYTEs	(call) signature 70h E9h 34h 37h
		signature must be 34h 37h 70h EFh if called via IOCTL
 04h	DWORD	(ret) pointer to FAR call entry point (see #0640)

(Table 0640)
Call IFSHLP.SYS entry point with:
	STACK:	WORD	function number (00h-0Ch)
			00h ???
			01h set ??? intercept
			02h remove ??? intercept
			03h ??? LPT2
			04h ??? LPT1
			05h ??? and remove ??? intercept
			06h set ??? flag
			07h clear ??? flag
			08h get ??? flag word
			09h ???
			0Ah ???
			0Bh ???
			0Ch get ???
---if function 00h---
Return: AX = ??? (0024h seen)
	DX = resident code segment
---if function 01h---
	STACK:	DWORD	new intercept address
Return: AX = status
	    0000h successful
	    0001h failed (already set)
		DX = 0000h
---if function 02h---
Return: AX = status
	    0000h successful
	    0001h failed (not set)
	DX = 0000h
---if function 03h,04h---
	STACK:	WORD	???
Return: AX = 0000h
	DX = 0000h
---if function 05h---
	???
---if function 06h---
Return: AX = 0001h and DX = 0000h if already set
	AX,DX unchanged if successful
---if function 07h---
Return: AX = 0001h and DX = 0000h if not set
	AX,DX unchanged if successful
---if function 08h---
Return: DX = 0000h
	AX = flags (bit 0 set/cleared by functions 06h and 07h)
---if function 09h---
Return: AX = status
	    0000h successful
	    0001h failed (already called)
---if function 0Ah---
	STACK:	WORD	???
	???
---if function 0Bh---
Return: AX = status
	    0000h successful
	    0001h failed (not set)
---if function 0Ch---
Return: AX = 0000h
	ES:BX -> ??? data
---if function > 0Ch---
Return:	AX = 0001h
	DX = 0000h
--------D-2140-------------------------------
INT 21 - DOS 2+ - "WRITE" - WRITE TO FILE OR DEVICE
	AH = 40h
	BX = file handle
	CX = number of bytes to write
	DS:DX -> data to write
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Notes:	if CX is zero, no data is written, and the file is truncated or
	  extended to the current position
	data is written beginning at the current file position, and the file
	  position is updated after a successful write
	the usual cause for AX < CX on return is a full disk
BUG:	a write of zero bytes will appear to succeed when it actually failed
	  if the write is extending the file and there is not enough disk
	  space for the expanded file (DOS 5.0-6.0); one should therefore check
	  whether the file was in fact extended by seeking to 0 bytes from
	  the end of the file (INT 21/AX=4202h/CX=0/DX=0)
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=28h,AH=3Fh,AH=93h,INT 2F/AX=1109h
--------G-2140-------------------------------
INT 21 - Turbo Debug HARDWARE BREAKPOINTS - SEND CMD TO HARDWARE BRKPNT DRIVER
	AH = 40h
	BX = handle for character device "TDHDEBUG"
	CX = number of bytes to write
	DS:DX -> hardware breakpoint command (see #0641)
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Note:	results are retrieved by reading from the device
SeeAlso: AH=3Fh"Turbo Debug"

Format of Turbo Debugger hardware breakpoint commands:
Offset	Size	Description	(Table 0641)
 00h	BYTE	command code
		00h install interrupt vectors
		01h get hardware capabilities
		02h enable hardware breakpoints
		03h disable hardware breakpoints
		04h set hardware breakpoint
		05h clear hardware breakpoint
		06h set I/O base address and reset hardware
		07h restore interrupt vectors
---command code 00h---
 01h	DWORD	pointer to Turbo Debugger entry point to be jumped to on
		  hardware breakpoint; call with CPU state the same as on
		  the breakpoint except for pushing AX and placing an entry
		  code (FFh if breakout button or breakpoint handle) in AH
---command code 04h---
 01h	BYTE	breakpoint type
		00h memory read
		01h memory write
		02h memory read/write
		03h I/O read
		04h I/O write
		05h I/O read/write
		06h instruction fetch
 02h	BYTE	address matching mode (see #0642)
 03h	DWORD	32-bit linear low address
 07h	DWORD	32-bit linear high address
 0Bh	WORD	pass count
 0Dh	BYTE	data size (01h, 02h, or 04h)
 0Eh	BYTE	source of matched bus cycle (01h CPU, 02h DMA, 03h either)
 0Fh	BYTE	data-matching mode (see #0642)
 10h	DWORD	low data value
 14h	DWORD	high data value
 18h	DWORD	data mask specifying which bits of the data are tested
---command code 05h---
 01h	BYTE	handle of breakpoint to clear (breakpoint returned from command
		  04h)
---command code 06h---
 01h	WORD	base address of hardware debugger board

(Table 0642)
Values for Turbo Debugger address/data matching mode:
 00h	match any
 01h	equal to test value
 02h	different from test value
 03h	above test value
 04h	below test value
 05h	below or equal to test value
 06h	above or equal to test value
 07h	within inclusive range
 08h	outside specified range
--------N-2140-------------------------------
INT 21 - PC/TCP IPCUST.SYS - WRITE CONFIGURATION DATA
	AH = 40h
	BX = handle for character device "$IPCUST"
	CX = number of bytes to write
	DS:DX -> buffer for configuration data (AH=3Fh"IPCUST")
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Notes:	if less than the entire data is read or written, the next read/write
	  continues where the previous one ended; IOCTL calls AX=4402h and
	  AX=4403h both reset the location at which the next operation starts
	  to zero
	the data pointer is also reset to zero if the previous read or write
	  reached or exceeded the end of the data, when the current function
	  is read and the previous was write, or vice versa
	v2.1+ uses a new configuration method, but allows the installation
	  of IPCUST.SYS for backward compatibility with other software which
	  must read the PC/TCP configuration
SeeAlso: AH=3Fh"IPCUST",AX=4402h"IPCUST"
--------y-2140-------------------------------
INT 21 U - Trusted Access - NB.SYS - SET STATE
	AH = 40h
	BX = handle for character device "$$NB$$NB"
	DS:DX -> state record (see #0638)
	CX ignored
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (05h,06h) (see #0885 at AH=59h)
Program: Trusted Access is a security and access-control package by Lassen
	  Software, Inc.; NB.SYS is a device driver to prevent the user from
	  terminating CONFIG.SYS or AUTOEXEC.BAT with Ctrl-Break
SeeAlso: AH=3Fh"NB.SYS"
--------j-214000BX0002-----------------------
INT 21 - FARTBELL.EXE - INSTALLATION CHECK
	AX = 4000h
	BX = 0002h
	CX = 0000h
	DS:DX = 0000h:0000h
Return: CF clear if installed
	    AX = CS of resident code
Program: FARTBELL is a joke program by Guenther Thiele which makes various
	  noises when programs output a bell
SeeAlso: AX=4001h
--------j-214001BX0002-----------------------
INT 21 - FARTBELL.EXE - FORCE NOISE
	AX = 4001h
	BX = 0002h
	CX = 0000h
	DS:DX = 0000h:0000h
Program: FARTBELL is a joke program by Guenther Thiele which makes various
	  noises when programs output a bell
SeeAlso: AX=4000h
--------D-2141-------------------------------
INT 21 - DOS 2+ - "UNLINK" - DELETE FILE
	AH = 41h
	DS:DX -> ASCIZ filename (no wildcards, but see notes)
	CL = attribute mask for deletion (server call only, see notes)
Return: CF clear if successful
	    AX destroyed (DOS 3.3) AL seems to be drive of deleted file
	CF set on error
	    AX = error code (02h,03h,05h) (see #0885 at AH=59h)
Notes:	(DOS 3.1+) wildcards are allowed if invoked via AX=5D00h, in which case
	  the filespec must be canonical (as returned by AH=60h), and only
	  files matching the attribute mask in CL are deleted
	DR-DOS 5.0-6.0 returns error code 03h if invoked via AX=5D00h
	DOS does not erase the file's data; it merely becomes inaccessible
	  because the FAT chain for the file is cleared
	deleting a file which is currently open may lead to filesystem
	  corruption.  Unless SHARE is loaded, DOS does not close the handles
	  referencing the deleted file, thus allowing writes to a nonexistant
	  file.
	under DRDOS and DR Multiuser DOS, this function will fail if the file
	  is currently open
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
BUG:	DR-DOS 3.41 crashes if called via AX=5D00h
SeeAlso: AH=13h,AX=4301h,AX=4380h,AX=5D00h,AH=60h,AH=71h,AX=F244h
SeeAlso: INT 2F/AX=1113h
--------y-214101DXFFFE-----------------------
INT 21 - SoftLogic Data Guardian - ???
	AX = 4101h
	DX = FFFEh
Return: AX = 0000h if installed
Note:	resident code sets several internal variables on this call
SeeAlso: AH=3Fh"NB.SYS",INT 16/AX=FFA3h/BX=0000h
--------D-2142-------------------------------
INT 21 - DOS 2+ - "LSEEK" - SET CURRENT FILE POSITION
	AH = 42h
	AL = origin of move
	    00h start of file
	    01h current file position
	    02h end of file
	BX = file handle
	CX:DX = offset from origin of new file position
Return: CF clear if successful
	    DX:AX = new file position in bytes from start of file
	CF set on error
	    AX = error code (01h,06h) (see #0885 at AH=59h)
Notes:	for origins 01h and 02h, the pointer may be positioned before the
	  start of the file; no error is returned in that case, but subsequent
	  attempts at I/O will produce errors
	if the new position is beyond the current end of file, the file will
	  be extended by the next write (see AH=40h)
BUG:	using this method to grow a file from zero bytes to a very large size
	  can corrupt the FAT in some versions of DOS; the file should first
	  be grown from zero to one byte and then to the desired large size
SeeAlso: AH=24h,INT 2F/AX=1228h
--------v-214203-----------------------------
INT 21 - VIRUS - "Shake" - INSTALLATION CHECK
	AX = 4203h
Return: AX = 1234h if resident
SeeAlso: AX=3DFFh,AX=4243h
--------v-214243-----------------------------
INT 21 - VIRUS - "Invader" - INSTALLATION CHECK
	AX = 4243h
Return: AX = 5678h if resident
SeeAlso: AX=4203h,AX=4B04h
--------D-214300-----------------------------
INT 21 - DOS 2+ - GET FILE ATTRIBUTES
	AX = 4300h
	DS:DX -> ASCIZ filename
Return: CF clear if successful
	    CX = file attributes (see #0643)
	    AX = CX (DR-DOS 5.0)
	CF set on error
	    AX = error code (01h,02h,03h,05h) (see #0885 at AH=59h)
Notes:	under the FlashTek X-32 DOS extender, the filename pointer is in DS:EDX
	under DR-DOS 3.41 and 5.0, attempts to change the subdirectory bit are
	  simply ignored without an error
BUG:	Windows for Workgroups returns error code 05h (access denied) instead
	  of error code 02h (file not found) when attempting to get the
	  attributes of a nonexistent file.  This causes open() with O_CREAT
	  and fopen() with the "w" mode to fail in Borland C++.
SeeAlso: AX=4301h,AX=4310h,AH=71h,AH=B6h,INT 2F/AX=110Fh,INT 60/DI=0517h
--------D-214301-----------------------------
INT 21 - DOS 2+ - "CHMOD" - SET FILE ATTRIBUTES
	AX = 4301h
	CX = new file attributes (see #0643)
	DS:DX -> ASCIZ filename
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,02h,03h,05h) (see #0885 at AH=59h)
Notes:	will not change volume label or directory attribute bits, but will
	  change the other attribute bits of a directory (the directory
	  bit must be cleared to successfully change the other attributes of a
	  directory, but the directory will not be changed to a normal file as
	  a result)
	MS-DOS 4.01 reportedly closes the file if it is currently open
	for security reasons, the Novell NetWare execute-only bit can never
	  be cleared; the file must be deleted and recreated
	under the FlashTek X-32 DOS extender, the filename pointer is in DS:EDX
	DOS 5.0 SHARE will close the file if it is currently open in sharing-
	  compatibility mode, otherwise a sharing violation critical error is
	  generated if the file is currently open
SeeAlso: AX=4300h,AX=4311h,AH=71h,INT 2F/AX=110Eh

Bitfields for file attributes:
Bit(s)	Description	(Table 0643)
 7	shareable (Novell NetWare)
 6	unused
 5	archive
 4	directory
 3	volume label
	execute-only (Novell NetWare)
 2	system
 1	hidden
 0	read-only
--------D-214302-----------------------------
INT 21 - DOS 7 (Chicago) - GET VOLUME INFORMATION
	AX = 4302h
	details not yet available
SeeAlso: AH=71h,AH=72h
--------O-214302-----------------------------
INT 21 - DR-DOS 3.41+ internal - GET ACCESS RIGHTS
	AX = 4302h
	DS:DX -> ASCIZ pathname
Return: CF clear if successful
	    CX = access rights (see #0644)
	    AX = CX (DR-DOS 5.0)
	CF set on error
	    AX = error code
Desc:	Determine which operations the calling program may perform on a
	  specified file without being required to provide a password.
Notes:	this protection scheme has been coordinated on all current Digital
	  Research/Novell operating systems (DR-DOS 3.41+, DRMDOS 5.x, and
	  FlexOS 2+)
	this function is documented in DR-DOS 6.0 and corresponds to the
	  "Get/Set File Attributes" function, subfunction 2, documented in
	  Concurrent DOS.
	only FlexOS actually uses the "execution" bits; DR-DOS 3.41+ treats
	  them as "read" bits.
	DR-DOS 3.41-5.x only use bits 0-3.  Only DR-DOS 6.0 using a
	  DRMDOS 5.x security system allowing for users and groups uses bits
	  4-11.
SeeAlso: AX=4303h

Bitfields for DR-DOS file access rights:
Bit(s)	Description	(Table 0644)
 0	owner delete requires password
 1	owner execution requires password (FlexOS)
 2	owner write requires password
 3	owner read requires password
 4	group delete requires password
 5	group execution requires password (FlexOS)
 6	group write requires password
 7	group read requires password
 8	world delete requires password
 9	world execution requires password (FlexOS)
 10	world write requires password
 11	world read requires password
--------O-214303-----------------------------
INT 21 - DR-DOS 3.41+ internal - SET ACCESS RIGHTS AND PASSWORD
	AX = 4303h
	CX = access rights
	     bits 11-0: access rights (see #0644)
	     bit 15: new password is to be set
	DS:DX -> ASCIZ pathname
	[DTA] = new password if CX bit 15 is set (blank-padded to 8 characters)
Return: CF clear if successful
	CF set on error
	    AX = error code
Notes:	if the file is already protected, the old password must be added after
	  the pathname, separated by a ";"
	this function is documented in DR-DOS 6.0 and corresponds to the
	  "Get/Set File Attributes" function, subfunction 3, documented in
	  Concurrent DOS.
SeeAlso: AH=0Fh,AH=17h,AX=4302h"DR-DOS",AX=4305h,AX=4454h
--------O-214304-----------------------------
INT 21 U - DR-DOS 5.0-6.0 internal - GET ENCRYPTED PASSWORD
	AX = 4304h
	DS:DX -> ASCIZ filename
	???
Return: CF clear if successful
	    CX = AX = 0000h if no password assigned to file
	CF set on error
	    AX = error code (see #0885 at AH=59h)
Note:	this function is only supported by DR-DOS 5.0 and 6.0 and DRMDOS 5.1
SeeAlso: AX=4303h,AX=4305h
--------O-214305-----------------------------
INT 21 U - DR-DOS 5.0-6.0 internal - SET EXTENDED FILE ATTRIBUTES
	AX = 4305h
	DS:DX -> ASCIZ filename
	???
Return: CF clear if successful
	CF set on error
	    AX = error code (see #0885 at AH=59h)
Desc:	this function allows the extended attributes, and optionally the
	  encrypted password, of a file to be set.
Note:	this function is only supported by DR-DOS 5.0 and 6.0 and DRMDOS 5.1
SeeAlso: AX=4304h,AX=4311h
--------O-214306-----------------------------
INT 21 - DR-DOS 6.0 - GET FILE OWNER
	AX = 4306h
	DS:DX -> ASCIZ filename
Return: CF clear if successful
	    AX = CX = value set with AX=4307h
	CF set on error
	    AX = error code (see #0885 at AH=59h)
SeeAlso: AX=4307h
--------O-214307-----------------------------
INT 21 - DR-DOS 6.0 - SET FILE OWNER
	AX = 4307h
	CX = ??? (owner identification number?)
	DS:DX -> ASCIZ filename
Return: CF clear if successful
	CF set on error
	    AX = error code (see #0885 at AH=59h)
SeeAlso: AX=4306h
--------N-214310-----------------------------
INT 21 - Banyan VINES 2.1+ - GET EXTENDED FILE ATTRIBUTES
	AX = 4310h
	DS:DX -> ASCIZ filename
Return: CF clear if successful
	    CH = attributes (see #0645)
	CF set on error
	    AX = error code (01h,02h,03h,05h) (see #0885 at AH=59h)
Note:	the filename may be a directory but must be on a VINES file service
SeeAlso: AX=4300h,AX=4311h,AH=B6h,INT 2F/AX=110Fh
--------N-214311-----------------------------
INT 21 - Banyan VINES 2.1+ - SET EXTENDED FILE ATTRIBUTES
	AX = 4311h
	CH = new attributes (see #0645)
	DS:DX -> ASCIZ filename
Return: CF clear if successful
	CF set on error
	    AX = error code (01h,02h,03h,05h) (see #0885 at AH=59h)
Note:	the filename may be a directory but must be on a VINES file service
SeeAlso: AX=4301h,AX=4305h,AX=4310h,INT 2F/AX=110Eh

Bitfields for VINES extended file attributes:
Bit(s)	Description	(Table 0645)
 7	unused
 6	shareable
 5	execute-only
 4-0	unused
--------O-214380-----------------------------
INT 21 - Novell DOS 7 - UNDELETE PENDING DELETE FILE
	AX = 4380h
	???
Return: ???
SeeAlso: AH=41h,AX=4381h
--------O-214381-----------------------------
INT 21 - Novell DOS 7 - PURGE PENDING DELETE FILE
	AX = 4381h
	???
Return: ???
SeeAlso: AH=41h,AX=4380h
--------D-214400-----------------------------
INT 21 - DOS 2+ - IOCTL - GET DEVICE INFORMATION
	AX = 4400h
	BX = handle
Return: CF clear if successful
	    DX = device information word (see #0646)
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h) (see #0885 at AH=59h)
Notes:	value in DH corresponds to high byte of device driver's attribute word
	  if handle refers to a character device
	Novell NetWare reportedly does not return a drive number in bits 5-0
	  for a disk file
SeeAlso: AX=4401h,INT 2F/AX=122Bh

Bitfields for device information word:
Bit(s)	Description	(Table 0646)
 character device
  14	device driver can process IOCTL requests (see AX=4402h)
  13	output until busy supported
  11	driver supports OPEN/CLOSE calls
   7	set (indicates device)
   6	EOF on input
   5	raw (binary) mode
   4	device is special (uses INT 29)
   3	clock device
   2	NUL device
   1	standard output
   0	standard input
 disk file
  15	file is remote (DOS 3+)
  14	don't set file date/time on closing (DOS 3+)
  11	media not removable
   8	(DOS 4 only) generate INT 24 if no disk space on write or read past
	  end of file
   7	clear (indicates file)
   6	file has not been written
  5-0	drive number (0 = A:)
--------D-214401-----------------------------
INT 21 - DOS 2+ - IOCTL - SET DEVICE INFORMATION
	AX = 4401h
	BX = handle (must refer to character device)
	DX = device information word (see #0646)
	    (DH must be zero)
Return: CF clear if successful
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4400h,INT 2F/AX=122Bh
--------D-214402-----------------------------
INT 21 - DOS 2+ - IOCTL - READ FROM CHARACTER DEVICE CONTROL CHANNEL
	AX = 4402h
	BX = file handle referencing character device
	CX = number of bytes to read
	DS:DX -> buffer
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	format of data is driver-specific (see below for some specific cases)
SeeAlso: AX=4400h,AX=4403h,AX=4404h,INT 2F/AX=122Bh
--------N-214402-----------------------------
INT 21 - Network Driver Interface Specification (NDIS) 2.0.1 - PROTOCOL MANAGER
	AX = 4402h
	BX = file handle for device "PROTMAN$"
	CX = 000Eh (size of request block)
	DS:DX -> request block (see #0647,#0648,#0649,#0650,#0651,#0655,#0656)
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4402h"FTPSOFT"

Format of NDIS request block for GetProtocolManagerInfo:
Offset	Size	Description	(Table 0647)
 00h	WORD	01h
 02h	WORD	returned status (see #0657)
 04h	DWORD	returned pointer to structure representing parsed user config
 08h	DWORD	unused
 0Ch	WORD	returned BCD version of NDIS on which Protocol Manager is based
SeeAlso: #0648,#0649,#0650,#0651,#0652,#0653,#0654,#0655,#0656

Format of NDIS request block for RegisterModule:
Offset	Size	Description	(Table 0648)
 00h	WORD	02h
 02h	WORD	returned status (see #0657)
 04h	DWORD	pointer to module's common characteristics table (see #0658)
 08h	DWORD	pointer to list of modules to which the module is to be bound
 0Ch	WORD	unused
SeeAlso: #0647,#0649,#0650,#0651,#0652,#0653,#0654,#0655,#0656

Format of NDIS request block for BindAndStart:
Offset	Size	Description	(Table 0649)
 00h	WORD	03h
 02h	WORD	returned status (see #0657)
 04h	DWORD	caller's virtual address in FailingModules structure
 08h	DWORD	unused
 0Ch	WORD	unused
SeeAlso: #0647,#0648,#0650,#0651,#0652,#0653,#0654,#0655,#0656

Format of NDIS request block for GetProtocolManagerLinkage:
Offset	Size	Description	(Table 0650)
 00h	WORD	04h
 02h	WORD	returned status (see #0657)
 04h	DWORD	returned dispatch point
 08h	DWORD	unused
 0Ch	WORD	returned protocol manager DS
Note:	the dispatch point may be called as follows instead of using this IOCTL
	STACK: WORD  protocol manager DS
	       DWORD pointer to request block
	Return: AX = returned status
		STACK popped
SeeAlso: #0647,#0648,#0649,#0651,#0652,#0653,#0654,#0655,#0656

Format of NDIS request block for GetProtocolIniPath:
Offset	Size	Description	(Table 0651)
 00h	WORD	05h
 02h	WORD	returned status (see #0657)
 04h	DWORD	pointer to a buffer for the ASCIZ pathname of PROTOCOL.INI
 08h	DWORD	unused
 0Ch	WORD	buffer length
SeeAlso: #0647,#0648,#0649,#0650,#0652,#0653,#0654,#0655,#0656

Format of NDIS request block for RegisterProtocolManagerInfo:
Offset	Size	Description	(Table 0652)
 00h	WORD	06h
 02h	WORD	returned status (see #0657)
 04h	DWORD	pointer to structure containing parsed user config file
 08h	DWORD	unused
 0Ch	WORD	length of structure
SeeAlso: #0647,#0648,#0649,#0650,#0651,#0653,#0654,#0655,#0656

Format of NDIS request block for InitAndRegister:
Offset	Size	Description	(Table 0653)
 00h	WORD	07h
 02h	WORD	returned status (see #0657)
 04h	DWORD	unused
 08h	DWORD	poitner to ASCIZ name of the module to be prebind initialized
 0Ch	WORD	unused
SeeAlso: #0647,#0648,#0649,#0650,#0651,#0652,#0654,#0655,#0656

Format of NDIS request block for UnbindAndStop:
Offset	Size	Description	(Table 0654)
 00h	WORD	08h
 02h	WORD	returned status (see #0657)
 04h	DWORD	failing modules as for BindAndStart
 08h	DWORD	if not 0000h:0000h, pointer to ASCIZ name of module to unbind
		if 0000h:0000h, terminate a set of previously dynamically
		  bound protocol modules
 0Ch	WORD	unused
SeeAlso: #0647,#0648,#0649,#0650,#0651,#0652,#0653,#0655,#0656

Format of NDIS request block for BindStatus:
Offset	Size	Description	(Table 0655)
 00h	WORD	09h
 02h	WORD	returned status (see #0657)
 04h	DWORD	must be 0000h:0000h
		on return, points to root tree
 08h	DWORD	0000h:0000h
 0Ch	WORD	unused under DOS
SeeAlso: #0647,#0648,#0649,#0650,#0651,#0652,#0653,#0654,#0656

Format of NDIS request block for RegisterStatus:
Offset	Size	Description	(Table 0656)
 00h	WORD	0Ah
 02h	WORD	returned status (0000h, 0008h, 002Ch) (see #0657)
 04h	DWORD	0000h:0000h
 08h	DWORD	pointer to 16-byte ASCIZ module name
 0Ch	WORD	0000h
Note:	not supported by the 10NET v5.0 PROTMAN$ driver
SeeAlso: #0647,#0648,#0649,#0650,#0651,#0652,#0653,#0654,#0655

(Table 0657)
Values for NDIS status code:
 0000h	success
 0001h	wait for release--protocol has retained control of the data buffer
 0002h	request queued
 0003h	frame not recognized
 0004h	frame rejected
 0005h	frame should be forwarded
 0006h	out of resource
 0007h	invalid parameter
 0008h	invalid function
 0009h	not supported
 000Ah	hardware error
 000Bh	transmit error
 000Ch	unrecognized destination
 000Dh	buffer too small
 0020h	already started
 0021h	binding incomplete
 0022h	driver not initialized
 0023h	hardware not found
 0024h	hardware failure
 0025h	configuration failure
 0026h	interrupt conflict
 0027h	MAC incompatible
 0028h	initialization failed
 0029h	no binding
 002Ah	network may be disconnected
 002Bh	incompatible OS version
 002Ch	already registered
 002Dh	path not found
 002Eh	insufficient memory
 002Fh	info not found
 00FFh	general failure
 F000h-FFFFh reserved for vendor-specific codes, treated as general failure

Format of NDIS common characteristics table:
Offset	Size	Description	(Table 0658)
 00h	WORD	size of table in bytes
 02h	BYTE	NDIS major version
 03h	BYTE	NDIS minor version
 04h	WORD	reserved
 06h	BYTE	module major version
 07h	BYTE	module minor version
 08h	DWORD	module function flag bits
		bit 0: binding at upper boundary supported
		bit 1: binding at lower boundary supported
		bit 2: dynamically bound
		bits 3-31 reserved, must be 0
 0Ch 16 BYTEs	ASCIZ module name
 1Ch	BYTE	upper boundary protocol level (see #0659)
 1Dh	BYTE	upper boundary interface type
		for MACs: 1 = MAC
		for data links and transports: to be defined
		for session: 1 = NCB
		any level: 0 = private (ISV-defined)
 1Eh	BYTE	lower boundary protocol level (see #0659)
 1Fh	BYTE	lower boundary interface type
		same as offset 1Dh
 20h	WORD	module ID filled in by protocol manager
 22h	WORD	module DS
 24h	DWORD	system request entry point
 28h	DWORD	pointer to service-specific characteristics (see #0661,#0663)
		0000h:0000h if none
 2Ch	DWORD	pointer to service-specific status, or 0000h:0000h if none
		  (see #0664)
 30h	DWORD	pointer to upper dispatch table (see #0660)
		0000h:0000h if none
 34h	DWORD	pointer to lower dispatch table (see #0660)
		0000h:0000h if none
 38h  2 DWORDs	reserved, must be 0
Note:	for compatibility with NDIS 1.x.x, a major version of 00h is
	  interpreted as 01h

(Table 0659)
Values for NDIS boundary protocol level:
 00h	physical
 01h	Media Access Control
 02h	Data link
 03h	network
 04h	transport
 05h	session
 FFh	not specified

Format of NDIS dispatch table:
Offset	Size	Description	(Table 0660)
 00h	DWORD	-> common characteristics table (see #0658)
 04h  4 BYTEs	???
 08h	DWORD	-> ??? function (called with 12 bytes of stack arguments)
 0Ch	DWORD	-> ??? function (called with 10 bytes of stack arguments)
 10h	DWORD	-> ??? function (called with 16 bytes of stack arguments)
 14h	DWORD	-> ??? function (called with 4 bytes of stack arguments)
 18h	DWORD	-> ??? function (called with 18 bytes of stack arguments)
 1Ch	DWORD	-> ??? function (called with 12 bytes of stack arguments)

Format of MAC Service-Specific Characteristics Table:
Offset	Size	Description	(Table 0661)
 00h	WORD	length of table in bytes
 02h 16 BYTEs	ASCIZ MAC type name, "802.3", "802.4", "802.5", "802.6", "DIX",
		  "DIX+802.3", "APPLETALK", "ARCNET", "FDDI", "SDLC", "BSC",
		  "HDLC", or "ISDN"
 12h	WORD	length of station addresses in bytes
 14h 16 BYTEs	permanent station address
 24h 16 BYTEs	current station address
 34h	DWORD	current functional adapter address (00000000h if none)
 38h	DWORD	pointer to multicast address list
 3Ch	DWORD	link speed in bits/sec
 40h	DWORD	service flags (see #0662)
 44h	WORD	maximum frame size which may be both sent and received
 46h	DWORD	total transmit buffer capacity in bytes
 4Ah	WORD	transmit buffer allocation block size in bytes
 4Ch	DWORD	total receive buffer capacity in bytes
 50h	WORD	receive buffer allocation block size in bytes
 52h  3 BYTEs	IEEE vendor code
 55h	BYTE	vendor adapter code
 56h	DWORD	pointer to ASCIZ vendor adapter description
 5Ah	WORD	IRQ used by adapter
 5Ch	WORD	transmit queue depth
 5Eh	WORD	maximum supported number of data blocks in buffer descriptors
 60h  N BYTEs	vendor-specific info
SeeAlso: #0663

Bitfields for service flags:
Bit(s)	Description	(Table 0662)
 0	supports broadcast
 1	supports multicast
 2	supports functional/group addressing
 3	supports promiscuous mode
 4	station address software settable
 5	statistics always current
 6	supports InitiateDiagnostics
 7	supports loopback
 8	MAC does primarily ReceiveChain indications instead of ReceiveLookahead
	indications
 9	supports IBM source routing
 10	supports MAC reset
 11	supports Open/Close adapter
 12	supports interrupt request
 13	supports source routing bridge
 14	supports GDT virtual addresses (OS/2 version)
 15	multiple TransferDatas allowed durign a single indication
 16	MAC normally sets FrameSize = 0 in ReceiveLookahead
 17-31	reserved, must be 0

Format of NetBIOS Service-Specific Characteristics Table:
Offset	Size	Description	(Table 0663)
 00h	WORD	length of table in bytes
 02h 16 BYTEs	ASCIZ type name of NetBIOS module
 12h	WORD	NetBIOS module code
 14h  N BYTEs	vendor-specific info
SeeAlso: #0661

Format of MAC Service-Specific Status Table:
Offset	Size	Description	(Table 0664)
 00h	WORD	length of table in bytes
 02h	DWORD	seconds since 0:00 1/1/70 when diagnostics last run
		(FFFFFFFFh = never)
 06h	DWORD	MAC status bits (see #0665)
 0Ah	WORD	current packet filter flags (see #0666)
 0Ch	DWORD	pointer to media-specific status table or 0000h:0000h
 10h	DWORD	seconds past 0:00 1/1/70 of last ClearStatistics
 14h	DWORD	total frames received (FFFFFFFFh = not counted)
 18h	DWORD	frames with CRC error (FFFFFFFFh = not counted)
 1Ch	DWORD	total bytes received (FFFFFFFFh = not counted)
 20h	DWORD	frames discarded--no buffer space (FFFFFFFFh = not counted)
 24h	DWORD	multicast frames received (FFFFFFFFh = not counted)
 28h	DWORD	broadcast frames received (FFFFFFFFh = not counted)
 2Ch	DWORD	frames with errors (FFFFFFFFh = not counted)
 30h	DWORD	overly large frames (FFFFFFFFh = not counted)
 34h	DWORD	frames less than minimum size (FFFFFFFFh = not counted)
 38h	DWORD	multicast bytes received (FFFFFFFFh = not counted)
 3Ch	DWORD	broadcast bytes received (FFFFFFFFh = not counted)
 40h	DWORD	frames discarded--hardware error (FFFFFFFFh = not counted)
 44h	DWORD	total frames transmitted (FFFFFFFFh = not counted)
 48h	DWORD	total bytes transmitted (FFFFFFFFh = not counted)
 4Ch	DWORD	multicast frames transmitted (FFFFFFFFh = not counted)
 50h	DWORD	broadcast frames transmitted (FFFFFFFFh = not counted)
 54h	DWORD	broadcast bytes transmitted (FFFFFFFFh = not counted)
 58h	DWORD	multicast bytes transmitted (FFFFFFFFh = not counted)
 5Ch	DWORD	frames not transmitted--timeout (FFFFFFFFh = not counted)
 60h	DWORD	frames not transmitted--hardware error (FFFFFFFFh = not countd)
 64h  N BYTEs	vendor-specific info

Bitfields for MAC status bits:
Bit(s)	Description	(Table 0665)
 0-2	operational status
	000 hardware not installed
	001 hardware failed startup diagnostics
	010 hardware configuration problem
	011 hardware fault
	100 operating marginally due to soft faults
	101 reserved
	110 reserved
	111 hardware fully operational
 3	MAC bound
 4	MAC open
 5	diagnostics in progress
 6-31	reserved

Bitfields for packet filter flags:
Bit(s)	Description	(Table 0666)
 0	directed/multicast or group/functional
 1	broadcast
 2	promiscuous
 3	all source routing
 4-15	reserved, must be zero
--------I-214402-----------------------------
INT 21 U - IBM SYSTEM 36/38 WORKSTATION EMULATION - VDI.SYS - GET ???
	AX = 4402h
	BX = handle for character device "GDMS"
	CX = number of bytes to read (>= 4)
	DS:DX -> buffer (see #0667)
Return: CF set on error
	    AX = error code (see #0885 at AH=59h)
	CF clear if successful
	    AX = number of bytes read

Format of System 36/38 emulator returned data:
Offset	Size	Description	(Table 0667)
 00h  4 BYTEs	???
 04h	DWORD	pointer to ???
 08h  4 BYTEs	???
--------m-214402-----------------------------
INT 21 U - LASTBYTE.SYS v1.19 - IOCTL - GET ??? TABLE
	AX = 4402h
	BX = handle for device "LA$TBYTE"
	CX = 0004h
	DS:DX -> DWORD to hold address of 39-byte table of ???
Return: CF set on error
	    AX = error code (see #0885 at AH=59h)
	CF clear if successful
	    AX = number of bytes read
Program: LASTBYTE.SYS is part of the shareware "The Last Byte" memory
	  management package by Key Software Products
SeeAlso: AX=4402h"HIGHUMM"
--------m-214402-----------------------------
INT 21 - HIGHUMM.SYS v1.17+ - IOCTL - GET API ADDRESS
	AX = 4402h
	BX = handle for device "KSP$UMM"
	CX = 0004h
	DS:DX -> DWORD to hold entry point (see #0668)
Return: CF set on error
	    AX = error code (see #0885 at AH=59h)
	CF clear if successful
	    AX = number of bytes read
Program: HIGHUMM.SYS is part of the shareware "The Last Byte" memory management
	  package by Key Software Products
SeeAlso: AX=4402h"LASTBYTE"

(Table 0668)
Call HIGHUMM.SYS entry point with:
	AH = 00h allocate UMB (same as XMS function 10h) (see INT 2F/AX=4310h)
	    DX = size in paragraphs
	    Return: BX = segment number (if successful)
		    DX = size of requested block/size of largest block
	AH = 01h deallocate UMB (same as XMS func 11h) (see INT 2F/AX=4310h)
	    DX = segment number of UMB
	AH = 02h request a bank-switched memory block
	    DX = size in paragraphs
	    Return: BX = segment number (if successful)
		    DX = size of requested block/size of largest block
	AH = 03h release a bank-switched memory block
	    DX = segment number
	AH = 04h transfer data to/from high memory
	    DS:SI -> source
	    ES:DI -> destination
	    CX = length in bytes
	    Note: enables bank-switched memory, does the copy, then disables
		bank-switched memory
	AH = 05h get a word from bank-switched memory
	    ES:DI -> word to read
	    Return: DX = word
	AH = 06h put a word to bank-switched memory
	    ES:DI -> word to write
	    DX = word
	AH = 07h put a byte to bank-switched memory
	    ES:DI -> byte to write
	    DL = byte
	AH = 08h enable bank-switched memory
	    DS:SI -> 6-byte status save area
	AH = 09h disable bank-switched memory
	    DS:SI -> 6-byte save area from enable call (AH=08h)
	AH = 0Ah assign name to UMB or high bank-switched block
	    DX = segment number
	    DS:SI -> 8-byte blank-padded name
	AH = 0Bh locate UMB block by name
	    DS:SI -> 8-byte blank-padded name
	    Return: BX = segment number (if successful)
		    DX = size of block
	AH = 0Ch locate bank-switched block by name
	    DS:SI -> 8-byte blank-padded name
	    Return: BX = segment number (if successful)
		    DX = size of block
Return: AX = status code
	    0001h successful
	    0000h failed
		BL = error code
		    80h not implemented
		    B0h insufficient memory, smaller block available
		    B1h insufficient memory, no blocks available
		    B2h invalid segment number
Note:	only functions 00h and 01h are always available; the remaining
	  functions are only enabled if the proper commandline switch is given
--------c-214402-----------------------------
INT 21 - SMARTDRV.SYS v3.x only - IOCTL - GET CACHE STATUS
	AX = 4402h
	BX = file handle for device "SMARTAAR"
	CX = number of bytes to read (min 28h)
	DS:DX -> buffer for status record (see #0669)
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4403h"SMARTDRV",INT 2F/AX=4A10h/BX=0000h

Format of SMARTDRV status record:
Offset	Size	Description	(Table 0669)
 00h	BYTE	write-through flag (always 01h)
 01h	BYTE	writes should be buffered (always 00h)
 02h	BYTE	cache enabled if 01h
 03h	BYTE	driver type (01h extended memory, 02h expanded)
 04h	WORD	clock ticks between cache flushes (currently unused)
 06h	BYTE	cache contains locked tracks if nonzero
 07h	BYTE	flush cache on INT 19 reboot if nonzero
 08h	BYTE	cache full track writes if nonzero
 09h	BYTE	double buffering (for VDS) state (00h off, 01h on, 02h dynamic)
 0Ah	DWORD	original INT 13 vector
 0Eh	BYTE	minor version number
 0Fh	BYTE	major version number
 10h	WORD	unused
 12h	WORD	sectors read			\
 14h	WORD	sectors already in cache	 > may be scaled rather than
 16h	WORD	sectors already in track buffer /  absolute counts
 18h	BYTE	cache hit rate in percent
 19h	BYTE	track buffer hit rate in percent
 1Ah	WORD	total tracks in cache
 1Ch	WORD	number of tracks in use
 1Eh	WORD	number of locked tracks
 20h	WORD	number of dirty tracks
 22h	WORD	current cache size in 16K pages
 24h	WORD	original (maximum) cache size in 16K pages
 26h	WORD	minimum cache size in 16K pages
 28h	DWORD	pointer to byte flag to increment for locking cache contents
--------d-214402-----------------------------
INT 21 - CD-ROM device driver - IOCTL INPUT
	AX = 4402h
	BX = file handle referencing character device for CD-ROM driver
	CX = number of bytes to read
	DS:DX -> control block (see #0671)
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	the data returned depends on the first byte of the control block; the
	  remainder of the control block is filled by the driver
SeeAlso: AX=4403h"CD-ROM",INT 2F/AX=0802h

(Table 0670)
Values for CD-ROM data being requested:
 00h	device driver header address
 01h	drive head location
 02h	reserved
 03h	error statistics
 04h	audio channel info
 05h	raw drive bytes (uninterpreted and device-specific)
 06h	device status
 07h	sector size
 08h	volume size
 09h	media change status
 0Ah	audio disk info
 0Bh	audio track info
 0Ch	audio Q-Channel info
 0Dh	audio sub-channel info
 0Eh	UPC code
 0Fh	audio status info

Format of CD-ROM control block:
Offset	Size	Description	(Table 0671)
 00h	BYTE	data being requested (see #0670)
---function 00h---
 01h	DWORD	device driver header address (see also AH=52h)
---function 01h---
 01h	BYTE	addressing mode
		00h HSG
		01h Red Book
 02h	DWORD	current location of drive's head
		logical sector number in HSG mode
		frame/second/minute/unused in Red Book mode
		(HSG sector = minute * 4500 + second * 75 + frame - 150)
---function 03h---
 01h  N BYTEs	undefined as of 5 Aug 88 specification
---function 04h---
 01h	BYTE	input channel (0-3) for output channel 0
 02h	BYTE	volume for output channel 0
 03h	BYTE	input channel (0-3) for output channel 1
 04h	BYTE	volume for output channel 1
 05h	BYTE	input channel (0-3) for output channel 2
 06h	BYTE	volume for output channel 2
 07h	BYTE	input channel (0-3) for output channel 3
 08h	BYTE	volume for output channel 3
Notes:	output channels 0 and 1 are left and right, 2 and 3 are left prime and
	  right prime; a volume of 00h is off
	the default setting is for each input channel to be assigned to the
	  same-numbered output channel at full (FFh) volume
---function 05h---
 01h	BYTE	number of bytes read
 02h 128 BYTEs	buffer for drive bytes
---function 06h---
 01h	DWORD	device parameters (see #0672)
---function 07h---
 01h	BYTE	read mode
		00h cooked
		01h raw
 02h	WORD	sector size in bytes
---function 08h---
 01h	DWORD	volume size in sectors
---function 09h---
 01h	BYTE	media change status
		00h don't know
		01h media unchanged
		FFh media has been changed
---function 0Ah---
 01h	BYTE	lowest audio track number
 02h	BYTE	highest audio track number
 03h	DWORD	start address of lead-out track (Red Book format)
--function 0Bh---
 01h	BYTE	track number (set by caller)
 02h	DWORD	starting point of track (Red Book format)
 06h	BYTE	track control info
		bits 15,14,12: track type (notice: bits not contiguous!)
			000 two audio channels, no pre-emphasis
			001 two audio channels with pre-emphasis
			010 data track
			100 four audio channels, no pre-emphasis
			101 four audio channels with pre-emphasis
			other reserved
		bit 13: digital copy permitted
---function 0Ch---
 01h	BYTE	CONTROL and ADR byte (as received from drive)
 02h	BYTE	track number
 03h	BYTE	point or index
 04h	BYTE	minute	\
 05h	BYTE	second	 > running time within track
 06h	BYTE	frame	/
 07h	BYTE	zero
 08h	BYTE	"AMIN" or "PMIN"     \
 09h	BYTE	"ASEC" or "PSEC"      > running time on disk
 0Ah	BYTE	"AFRAME" or "PFRAME" /
---function 0Dh---
 01h	DWORD	starting frame address (Red Book format)
 05h	DWORD	transfer address
 09h	DWORD	number of sectors to read
Note:	copies 96 bytes of sub-channel info per sector into buffer
---function 0Eh---
 01h	BYTE	CONTROL and ADR byte
 02h  7 BYTEs	UPC/EAN code (13 BCD digits,low-order nybble of last byte is 0)
 09h	BYTE	zero
 0Ah	BYTE	"AFRAME"
---function 0Fh---
 ??? documentation not yet available
 01h	WORD	pause status (0000h not paused, 0001h paused)
 03h	DWORD	audio play start address
 07h	DWORD	??? audio play length or end address

Bitfields for CD-ROM device parameters:
Bit(s)	Description	(Table 0672)
 0	door open
 1	door unlocked
 2	supports raw reading in addition to cooked
 3	writable
 4	can play audio/video tracks
 5	supports interleaving
 6	reserved
 7	supports prefetch requests
 8	supports audio channel control
 9	supports Red Book addressing in addition to HSG
 10	audio is playing
 11	no disk in drive
 12	supports R-W subchannels
--------m-214402-----------------------------
INT 21 - Quarterdeck - QEMM-386 v5+ - GET API ENTRY POINT
	AX = 4402h
	BX = file handle for device "QEMM386$"
	CX = 0004h
	DS:DX -> DWORD buffer for API entry point
Return: CF clear if successful
	    buffer filled (see INT 67/AH=3Fh for entry point parameters)
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	Quarterdeck recently (June 1993) documented this function, but the
	  documentation incorrectly states that it is only available for
	  QEMM 6+
SeeAlso: AX=4402h"HOOKROM",INT 2F/AX=D201h/BX=5145h,INT 67/AH=3Fh
--------Q-214402-----------------------------
INT 21 U - Quarterdeck - HOOKROM.SYS - GET HOOKED VECTOR TABLE
	AX = 4402h
	BX = file handle for device "HOOKROM$"
	CX = 0004h
	DS:DX -> DWORD buffer for address of hooked vector table (see #0673)
Return: CF clear if successful
	    DS:DX buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4402h/SF=01h

Format of HOOKROM.SYS hooked vector table entry:
Offset	Size	Description	(Table 0673)
 00h  5 BYTEs	FAR jump to actual interrupt handler
		(end of table if first byte is not EAh)
 05h	BYTE	interrupt vector number
--------d-214402-----------------------------
INT 21 - Advanced SCSI Programming Interface (ASPI) - INTERFACE
	AX = 4402h
	BX = file handle for device "SCSIMGR$"
	CX = 0004h or 0005h (see notes)
	DS:DX -> buffer for result (see #0674), set to zeros before call
Return: CF clear if successful
	    AX = 0004h or 0005h (see notes)
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	the variant of the call requesting five bytes is an UNDOCUMENTED
	  extension supported by Adaptec's ASPI2DOS.SYS, ASPI4DOS.SYS, and
	  ASPI7DOS.SYS; if made of a host manager which does not support the
	  variant, only four bytes will be returned.  If the variant is
	  supported, Adaptec's WINASPI.DLL assumes that the host manager is
	  an "advanced" one which operates in either real or protected mode
	  (and thus does not require a DPMI INT 31/AX=0301h call to be invoked
	  from protected mode).	 Support of the five-byte variant also appears
	  to imply that an advanced ASPI host manager uses no temporary
	  storage space except the SRB (see #0676) and the stack, and that it
	  is fully reentrant.
	if called with a standard request for four bytes, even Adaptec's
	  advanced drivers return only the requested four bytes containing the
	  ASPI entry point address
	the function address is called with the address of a SCSI Request
	  Block (see #0676) on the stack and the caller must clean up the
	  stack
SeeAlso: AX=440Ch"ASPITAPE",INT 11/AH=FFh"WD7000"

Format of ASPI IOCTL result:
Offset	Size	Description	(Table 0674)
 00h	DWORD	function address
 04h	BYTE	number of SCSI host adapters supported by host manager

(Table 0675)
Values for ASPI request number:
 00h	"HA_INQ"	host adapter inquiry
 01h	"GET_TYPE"	get device type
 02h	"EXEC_SIO"	execute SCSI I/O
 03h	"ABORT_SRB"	abort SRB
 04h	"RESET_DEV"	reset SCSI device
 05h	"SET_HAPRMS"	set host adapter parameters
 06h	get disk drive information

Format of SCSI Request Block (64 bytes):
Offset	Size	Description	(Table 0676)
 00h	BYTE	request number (see #0675)
 01h	BYTE	request status (see #0677)
 02h	BYTE	host adapter ID
 03h	BYTE	request flags (see #0678)
 04h	DWORD	reserved
---request 00h---
 08h	BYTE	(ret) number of host adapters
 09h	BYTE	(ret) target adapter ID
 0Ah 16 BYTEs	(ret) SCSI manager ID
 1Ah 16 BYTEs	(ret) host adapter ID
 2Ah 16 BYTEs	(ret) host adapter-unique parameters
---request 01h---
 08h	BYTE	target ID
 09h	BYTE	logical unit number
 0Ah	BYTE	(ret) device type (see #0681)
---request 02h---
 08h	BYTE	target ID
 09h	BYTE	logical unit number
 0Ah	DWORD	data allocation length
 0Eh	BYTE	sense allocation length
 0Fh	DWORD	data buffer pointer
 13h	DWORD	next request pointer (for linking)
 17h	BYTE	CDB length
 18h	BYTE	(ret) host adapter status (see #0676)
 19h	BYTE	(ret) target status (see #0680)
 1Ah	DWORD	post routine address
 1Eh	WORD	real mode Post DS
 20h	DWORD	SRB pointer
 24h	WORD	reserved
 26h	DWORD	SRB physical address
 2Ah 22 BYTEs	SCSIMGR$ workspace
 40h  N BYTEs	CCB, including sense data (20-24 bytes)
---request 03h---
 08h	DWORD	address of SRB to abort
---request 04h---
 08h	BYTE	target ID
 09h	BYTE	logical unit number
 0Ah 14 BYTEs	reserved
 18h	BYTE	(ret) host adapter status (see #0679)
 19h	BYTE	(ret) target status (see #0680)
 1Ah	DWORD	post routine address
 1Eh 34 BYTEs	workspace
---request 05h---
 08h 16 BYTEs	host adapter-unique parameters
---request 06h---
 08h	BYTE	target ID
 09h	BYTE	logical unit number
 0Ah	BYTE	disk drive flags (see #0682)
 0Bh	BYTE	INT 13h drive number
 0Ch	BYTE	preferred head number translation
 0Dh	BYTE	preferred sector size translation
 0Eh 10 BYTEs	reserved
SeeAlso: #0683

(Table 0677)
Values for ASPI request status:
 00h	not done yet
 01h	completed successfully
 02h	aborted by host
 04h	SCSI I/O error
 80h	invalid
 81h	no adapter
 82h	no device attached
 else	status

Bitfields for ASPI request flags:
Bit(s)	Description	(Table 0678)
 0	posting enabled
 1	linking enabled
 2	direction
 3	transfer from SCSI target to host
 4	transfer from host to SCSI target
Note:	no data is transferred if both bits 3 and 4 are set

(Table 0679)
Values for host adapter status:
 00h	no error detected
 11h	select timeout
 12h	data overrun
 13h	bus error
 14h	bus failure

(Table 0680)
Values for target status:
 00h	no status
 02h	sense data stored in SRB
 08h	target busy
 18h	reservation error

(Table 0681)
Values for device type:
 00h	disk drive
 01h	tape drive (streamer)
 02h	printer
 03h	processor
 04h	WORM drive
 05h	CD-ROM drive
 06h	scanner
 07h	optical drive
 08h	autochanger
 09h	communications device

(Table 0682)
Values for disk drive flags:
 00h	no INT 13 access
 01h	INT 13 with DOS access
 02h	INT 13 without DOS access
 03h	invalid flags

Format of CCB:
Offset	Size	Description	(Table 0683)
 00h	BYTE	command code (see #0684)
 01h	BYTE	flags
		bits 4-0: vary by function
		bits 7-5: logical unit number
 02h	BYTE	"adr_1"
 03h	BYTE	"adr_0"
 04h	BYTE	length
 05h	BYTE	control
	...
 06h/0Ah 14 BYTEs buffer for sense data (see #0685)
SeeAlso: #0676

(Table 0684)
Values for CCB command code:
 00h	test unit ready
 01h	rewind
 03h	request sense data
 05h	get block size limits
 08h	Group 0 read
 0Ah	Group 0 write
 10h	write file marks
 11h	SCSI Space (set position?)
 12h	SCSI Inquire
 15h	set mode information
 16h	reserve SCSI device
 17h	release SCSI device
 19h	erase
 1Ah	request mode information
 1Bh	load/unload media
 1Dh	request target self-check
 24h	set window parameters
 25h	get window parameters
 28h	Group 1 read
 2Ah	Group 1 write
 31h	document feeder control
 34h	get scan data status
---vendor-specific commands---
 D3h	get document feeder status
 D4h	set document feeder mode

Format of sense data:
Offset	Size	Description	(Table 0685)
 00h	BYTE	error code (bit 7 set if valid)
 01h	BYTE	segment number
 02h	BYTE	sense key
		bit 6: EOM
		bit 5: ILI
		bits 0-3: sense key (see #0686)
 03h  4 BYTEs	information bytes
 07h	BYTE	additional sense length (0Ah)
 08h  4 BYTEs	command-specific information
 0Ch	BYTE	additional sense code
 0Dh	BYTE	additional sense code qualifier
 0Eh	BYTE	field replaceable unit code
 0Fh  3 BYTEs	sense key specific bytes

(Table 0686)
Values for sense key:
 00h	no sense data
 02h	SCSI unit not ready
 03h	media error
 04h	unrecoverable hardware error
 05h	illegal parameter in CDB
 06h	target has been reset
 0Bh	target aborted command
--------m-214402-----------------------------
INT 21 U - Qualitas 386MAX v6.00+ - IOCTL INPUT - GET STATE
	AX = 4402h
	BX = file handle for device "386MAX$$"
	CX = number of bytes to read
	DS:DX -> BYTE 03h followed by 386MAX state buffer (see #0687)
Return: CF clear if successful
	    buffer at DS:DX+1 filled
	    AX = number of bytes actually copied
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Notes:	if the value given in CX is less than the size of the state record
	  (5Ah for v6.01, 66h for v7.00), only a partial state record will be
	  returned
	the state is 40h bytes for 386MAX (actually ASTEMM) v2.20 ("386MAX$$"
	  did not exist yet, use "QMMXXXX0" and then "EMMXXXX0" instead) and
	  56h bytes for v5.11.
	to invoke 386MAX API functions, push DX onto the stack, load DX with
	  the word at offset 25h in the returned state, load all other
	  registers as needed for the desired function, and execute an
	  OUT DX,AL or OUT DX,AX; DX will be set to the pushed value on return
	  if it is not otherwise modified by the API function.	For safety,
	  in case a function is not supported or 386MAX is not present, SP
	  should be saved and restored around the API call.
	Windows 3.1 Standard mode, LAN Manager, and Windows for Workgroups all
	  use the 386MAX API; LAN Manager and Windows for Workgroups reportedly
	  make some calls incorrectly
SeeAlso: AX=4403h/SF=03h"386MAX",INT 67/AH=3Fh

Format of 386MAX v6.01+ state:
Offset	Size	Description	(Table 0687)
 -1	BYTE	(call) 03h
 00h  6 BYTEs	signature "386MAX"
 06h  4 BYTEs	version string "N;NN" or "N.NN" (i.e. "6;01" for v6.01)
		(';' by default; apparently changed to a period when 386MAX
		has linked high RAM into DOS's memory chain)
 0Ah	WORD	segment of low-memory portion of 386MAX.SYS
 0Ch  2 BYTEs	???
 0Eh	WORD	segment of ??? memory block or 0000h
 10h	WORD	bit flags 1 (see #0688)
 12h	WORD	starting address of video memory in KB
 14h  2 BYTEs	???
 16h	WORD	total high DOS memory in KB
 18h  2 BYTEs	???
 1Ah	WORD	available shared memory in KB
 1Ch	WORD	KBytes extended memory used by 386MAX
 1Eh  2 BYTEs	???
 20h	WORD	total extended memory in KB
 22h	WORD	IO port to write (OUT DX,AL) to invoke 386MAX INT 15 functions
 24h	WORD	IO port to write (OUT DX,AL) to invoke 386MAX API functions
		  (see #0701)
 26h	WORD	??? (depends on DOS version)
 28h	WORD	size of ??? in paragraphs
 2Ah	DWORD	machine type (see #0696)
 2Eh	DWORD	-> first DOS memory control block
 32h	WORD	system configuration flags (see #0689)
 34h	WORD	debugging flags 1 (see #0690)
 36h	WORD	debugging flags 2 (see #0691)
 38h  2 BYTEs	???
 3Ah	WORD	segment of first MCB in high memory chain
 3Ch	WORD	feature flags 1 (see #0693)
 3Eh	WORD	feature flags 2 (see #0694)
 40h	WORD	feature flags 3 (see #0695)
 42h	WORD	segment of first 386MAX control block??? (see #0697)
 44h	WORD	amount of memory to report available on INT 15/AH=88h
 46h  4 BYTEs	???
 4Ah	WORD	number of K at start of address space swapped with fast
		  extended memory (SWAP= parameter)
 4Ch  2 BYTEs	???
 4Eh	WORD	segment address of ???
 50h	WORD	debugging flags 3 (see #0692)
 52h	DWORD	old INT 21h
 56h	DWORD	pointer to 386MAX's EMS (INT 67h) handler
---386MAX v7.00---
 5Ah	DWORD	KB of extended memory managed by 386MAX
 5Eh	DWORD	bytes of extended memory (EXT= parameter)
 62h  4 BYTEs	???

Bitfields for 386MAX bit flags 1:
Bit(s)	Description	(Table 0688)
 1	???
 2	allow A20 to be enabled/disabled???
 3	??? (cleared by calling INT 67 functions or starting MSWindows)
 4	high RAM present???
 5	386MAX in AUTO mode
 6	386MAX enabled
 7	386MAX is providing EMS services
 8	??? (affects API function 08h)
 9	A20 gate closed (A20 disabled) (see INT 15/AX=2402h)
 10	Weitek support enabled
 11	???
 12	ROMs not shadowed???
 13	QPMS has been used
 14	???
 15	???

Bitfields for 386MAX system configuration flags:
Bit(s)	Description	(Table 0689)
 1	ROM compressed???
 3	???
 5	386MAX loaded into high memory
 6	Microchannel bus
 7	Weitek math coprocessor detected
 9	??? (also generates INT 01 on ??? and INT 03 on ???)
 11	PC/XT (thus only single 8259 interrupt controller present, DMA only
		in 1st megabyte, etc)
 13	LMLTOP= specified
 14	enable A20 control???
 15	???

Bitfields for 386MAX debugging flags 1:
Bit(s)	Description	(Table 0690)
 0	DEBUG=LED
 1	DEBUG=X67
 2	DEBUG=INV
 3	DEBUG=EMSPTED
 4	DEBUG=JMP
 5	DEBUG=CALL
 6	DEBUG=HLT
 7	DEBUG=PMR
 8	DEBUG=CR3
 9	DEBUG=CAPS or DEBUG=INT
 10	DEBUG=RC
 11	DEBUG=ROM
 12	DEBUG=XM
 13	DEBUG=SOR
 14	DEBUG=XR
 15	DEBUG=EMSERR (generate INT 01 on returning error from EMS call)

Bitfields for 386MAX debugging flags 2:
Bit(s)	Description	(Table 0691)
 0	DEBUG=ROMSWAP
 1	DEBUG=UNSHADOWROM
 2	DEBUG=COMPROM
 3	DEBUG=DPMIPHYS
 4	DEBUG=ALLROM
 5	DEBUG=VMS
 6	DEBUG=XMS (generate INT 01 on XMS calls)
 7	DEBUG=I06
 8	DEBUG=VCPI
 9	DEBUG=XDMA
 10	DEBUG=X09
 13	DEBUG=I67 (generate INT 01 on every INT 67 call)
 14	DEBUG=EVM (generate INT 01 on entering V86 mode)
 15	DEBUG=EMSSAVE or DEBUG=VDS

Bitfields for 386MAX debugging flags 3:
Bit(s)	Description	(Table 0692)
 10	DEBUG=EPM
 12	DEBUG=ABIOS
 13	DEBUG=XMSPTED
 14	DEBUG=TIME
 15	DEBUG=SCRUB

Bitfields for 386MAX feature flags 1:
Bit(s)	Description	(Table 0693)
 1	Weitek present
 2	no DPMI services
 3	NODMA
 4	TERSE
 5	NOROM
 6	NOPARITY
 8	NOFLEX (IGNOREFLEXFRAME)
 11	don't create UMBs
 12	don't backfill below video memory (NOLOW)
 13	FRAME= specified
 14	EXT= specified
 15	NOEMS, allow prior expanded memory manager to provide EMS

Bitfields for 386MAX feature flags 2:
Bit(s)	Description	(Table 0694)
 0	UNSHIFT specified (FORCEA20 disabled)
 1	NOXRAM
 2	NOSCSI specified
 3	SCREEN specified
 4	enabled EISADMA
 5	slow DMA
 6	RESETKEYB specified
 7	???
 9	TOP384
 10	???
 11	NOWARMBOOT
 12	USE= specified
 13	ROM= specified

Bitfields for 386MAX feature flags 3:
Bit(s)	Description	(Table 0695)
 0	Windows3 support enabled
 1	SHADOWROM
 2	don't compress ROM (NOCOMPROM)
 3	??? (related to PRGREG=)
 4	??? (related to PRGREG=)
 5	SHADOWRAM
 6	DOS4 specified
 7	NOLOADHIGH
 8	NOPULSE
 11	FORCEA20
 12	DMA buffer enabled
 13	NOSCRUB
 15	NOFRAME

Bitfields for 386MAX machine type:
Bit(s)	Description	(Table 0696)
 12	Amstrad
 13	Epson
 14	Zenith Data Systems
 15	"ASEM"
 16	NEC
 17	"HPRS" model codes 69h and 6Ah
 18	Dell
 19	"CA"
 20	ITT (Xtra Business Systems/Alcatel)
 21	Toshiba 5100
 22	Olivetti
 23	Quadram Quad386 (BIOS model FEh, submodel A6h)
 24	Tandy???
 25	AST 386
 26	INBOARD, ??? version
 27	INBOARD, ??? version
 28	INBOARD, ??? version
 29	"HPRS"
 30	Compaq 386
 31	JET386

Format of 386MAX control block:
Offset	Size	Description	(Table 0697)
 00h	WORD	segment of next block (FFFFh if last)
 02h	WORD	segment of previous block (FFFFh if first)
 04h 12 BYTEs	filename
 10h	WORD	resident size in paragraphs
 12h	WORD	environment size???
 14h	WORD	real prsent environment size + 1 (0000h if ENVSAVE used)
 16h  2 BYTEs	???
 18h	DWORD	initial size or SIZE=n in 386LOAD commandline
 1Ch	DWORD	SIZE=-1 ???
 20h	DWORD	SIZE= ???
 24h	BYTE	PRGREG= if specified, else FFh
 25h	BYTE	ENVREG= if specified, else FFh
 26h	BYTE	FlexFrame (00h not present, 01h present)
 27h  3 BYTEs	???
 2Ah	BYTE	GROUP= or 00h if not present
 2Bh	BYTE	???
 2Ch	WORD	PSP

Format of 386MAX high memory info record:
Offset	Size	Description	(Table 0698)
 00h	WORD	segment address of memory region
 02h	WORD	size of memory region in paragraphs
 04h	BYTE	type or flags???
		00h if locked out
		02h if EMS page frame
		04h if high RAM
		42h if ROM
 05h	BYTE	???

Format of 386MAX ROM shadowing record:
Offset	Size	Description	(Table 0699)
 00h	WORD	logical start segment of ROM??? (may be used by BlueMAX when it
		  squeezes together the ROMs to make room)
 02h	WORD	physical start segment of ROM
 04h  2 BYTEs	???
 06h	WORD	size of shadowed ROM in paragraphs
 08h  2 BYTEs	???
 0Ah	WORD	flags
		bit 15: shadowing enabled for this ROM???
		bit 14: ???
		bit 13: ???
		bit 12: ???
		bit 10: ???

(Table 0700)
Values for 386MAX memory type:
 00h	unused by EMS
 01h	DOS
 04h	page frame overlapping ROM???
 80h	high memory
 84h	page frame???
 87h	video ROM???
Note:	the type may be 00h (unused) if the 16K page is split among different
	  uses (such as ROM and high RAM)

(Table 0701)
Call 386MAX API (via OUT DX,AL) with:
	STACK: WORD value for DX
	AH = 00h unused
		Return: AH = 84h (unsupported function)
	AH = 01h get high memory information
		ES:DI -> buffer for array of high memory info records
			(see #0698)
		Return: CX = number of records placed in buffer
	AH = 02h get shadowed ROM info
		ES:DI -> buffer for array of ROM shadowing records (see #0699)
		Return: CX = number of records placed in buffer
	AH = 03h get 386MAX state
		ES:DI -> 90-byte buffer for state (see #0687)
		Return: AH = 00h (successful)
			buffer filled
	AH = 04h get memory types???
		ES:DI -> buffer for memory type info (array of bytes, one per
			16K page) (see #0700)
		Return:	CX = number of bytes placed in buffer
	AH = 05h get page table entries
		AL = A20 control (00h enable A20 first, 01h leave unchanged)
		CX = buffer size in bytes (0000h = enough for all memory from
			given start to end of memory managed by 386MAX)
		SI = first K to report (rounded down to 4K page)
		ES:DI -> buffer for returned page table entries
		Return: CX = number of bytes returned (four per 4K page)
			ES:DI buffer filled
	AH = 06h get memory speed info
		ES:DI -> buffer for memory speed records (see #0702)
		Return: AH = 00h (successful)
			CX = number of bytes placed in buffer
		Note:	this function can take over a second to execute
	AH = 07h map/unmap multiple handle pages
		DX = EMS handle (on stack)
		STACK: DWORD -> EMS mapping record
		Return:	AH = status (00h,80h,83h,8Ah,8Bh)
		Format of EMS mapping record:
		Offset	Size	Description
		 00h	WORD	function
				0000h use physical page numbers
				0001h use segment addresses
		 02h	WORD	EMS handle
		 04h	WORD	number of mapping entries following
		 06h 2N WORDs	logical page number and physical page/segment
				logical page FFFFh means unmap physical page
		SeeAlso: INT 67/AH=50h
	AH = 08h "EMM2_GOREAL" check whether possible to disable 386MAX
		AL = ??? (00h or nonzero)
		Return: AH = status (00h OK, A4h not possible at this time)
		Note:	if AL=00h, this function always returns success
	AH = 09h toggle Bit Flags 1 flags
		BX = bitmask of bit flags 1's flags to toggle (see #0688)
		Return: AH = 00h (successful)
		Note:	enables A20 first
	AH = 0Ah toggle Debugging Flags 1 flags
		BX = bitmask of Debugging Flags 1's bits to toggle (see #0690)
		Return: AH = 00h (successful)
		Notes:	enables A20 first
			does ??? if bit 3 on after specified bits are toggled
	AH = 0Bh toggle Debugging Flags 2 flags
		BX = bitmask of Debugging Flags 2's bits to toggle (see #0691)
		Return: AH = 00h (successful)
		Note:	enables A20 first
	AH = 0Ch toggle feature flags 3
		BX = bitmask of feature flags 3's bits to toggle (see #0695)
		Return: AH = 00h (successful)
		Note:	enables A20 first
	AH = 0Dh specify 386MAX high-memory location
		BX = segment address of high-memory real-mode portion of 386MAX
		CX = current segment of real-mode stub???
		Return: AH = status (00h successful)
			???
	AH = 0Eh CRT controller register virtualization
		AL = subfunction
		    00h allow access to CRTC I/O ports 03B4h/03B5h, 03D4h/03D5h
		    01h trap accesses to CRTC I/O ports
	AH = 0Fh reboot system
		Return: never
	AH = 10h unused
		Return: AH = 84h (unsupported function)
	AH = 11h get high memory information
		ES:DI -> 96-byte buffer for high memory info
		Return: AH = 00h (successful)
			ES:DI buffer filled
		Notes:	each byte in buffer contains bit flags for a 4K page in
			  the A000h-FFFFh region
				bit 0: page is writeable
				bit 1: physical address same as linear address
				bit 2: EMS page frame
				bit 6: page is part of the QPMS window
			this function can take over a second to execute,
			  because it does a 128K read for each page in an
			  attempt to flush any RAM cache the system may have
	AH = 12h shadow RAM mapping
		AL = subfunction
		    00h unshadow ROMs (except page FFh if NOWARMBOOT set)
		    01h map shadow RAM into ROM regions???
		Return: AH = 00h (successful) if AL=00h or 01h
			AH = 8Fh otherwise
	AH = 13h shadow RAM page protection
		AL = subfunction
		    00h set all shadowed ROM 4K pages to read-only
		    01h set all shadowed ROM 4K pages to read-write
		Return: AH = 00h (successful) if AL=00h or 01h
			AH = 8Fh otherwise
	AH = 14h get Programmable Option Select info???
		ES:DI -> 54-byte buffer for POS data???
		Return: AH = 00h if successful
			AH = A4h on error
		Note:	the buffer consists of nine 6-byte fields; the first
			  eight for slots 1-8, the last for the system board
	AH = 15h ???
		???
		Return: ???
	AH = 16h get 386MAX memory usage screen
		ES:DI -> buffer for memory info display
		CX = size of buffer in bytes
		Return:	ES:DI buffer filled with '$'-terminated string (if
				large enough to hold entire usage screen)
		Note:	the screen is 0303h bytes in v7.00
	AH = 17h Windows 3 startup/termination
		AL = subfunction
		    00h Windows3 initializing
			DX (on stack) = Windows startup flags
			DI = Windows version number (major in upper byte)
			ES:BX = 0000h:0000h
			DS:SI = 0000h:0000h
			Return: CX = 0000h if OK for Windows to load
				   <> 0 if Windows should not load
				ES:BX -> startup info structure
				DS:SI -> Virtual86 mode enable/disable callback
		    01h Windows3 terminating
			ES:BX -> ???
			DX (on stack) = Windows exit flags
			Return: ???
	AH = 18h QPMS (Qualitas Protected Memory Services)
		AL = subfunction
		    00h get QPMS configuration
			Return: BX = starting segment of QPMS memory window
				CX = number of 4K pages reserved for QPMS???
				DX = number of 4K pages in QPMS window???
		    01h map QPMS memory page???
			BX = 4K page number within memory reserved for QPMS???
			CL = 4K page number within QPMS memory window???
		    02h mark all QPMS memory read-only
		    03h mark all QPMS memory read-write
		Return: AH = status (00h,8Ah,8Bh,8Fh)
	AH = 19h get linear address for physical address
		EDX = physical address (low word on stack)
		Return: AH = status
			    00h successful
				EDX = linear address at which physical address
					may be accessed
			    8Bh physical address currently not addressable
		Note:	enables A20 first
	AH = 1Ah set page table entry
		EDX = new page table entry (low word on stack)
		ESI = linear address of page to map (bits 0-11 clear)
		Return: AH = status (00h,8Bh)
		Note:	enables A20 first
	AH = 1Bh get ???
		Return: AH = status
			BX = ???
			CX = number of ???
			EDX = physical address of ???
	AH = 1Ch get original interrupt vector
		AL = interrupt vector (00h-7Fh)
		Return: AH = 00h (successful)
			EDX = original vector before 386MAX loaded (segment in
				high word, offset in low word)
		Note:	no range checking is performed; requests for INTs 80h-
			  FFh will return random values
	AH = 1Dh display string???
		SI = ???
		Return: AH = 00h (successful)
			???
		Note:	this function appears to be broken in v7.00
	AH = 1Eh get memory info
		ES:DI -> memory info (see #0703)
		Return: ???
	AH = 1Fh get DPMI host information
		Return: AX = 0000h if successful
			BX = DPMI flags (see #1819 at INT 31/AX=0400h)
			CL = CPU type (02h = 80286, 03h = 80386, etc.)
			DX = DPMI ver supported (DH=major, DL=2-digit minor)
			SI = ???
			ES???:DI -> ???
		Note:	NOP if NODPMI switch specified
	AH = 20h (v7.00) get ???
	    AL = index of ???
	    Return: EDX = ??? for specified ???
	AH = 21h (v7.00) STACKS support
	    AL = 00h get STACKS parameters
		Return: BX = ??? (0060h for v7.00)
			CX = number of stacks for hardware interrupts
			DX = size of each stack in bytes
			SI = ??? (low and high bytes are separate values)
			DI = ??? (low and high bytes are separate values)
			    low byte = logical page number set by subfn 02h
			ES = ???
	    AL = 01h set ??? "EMM2_DSTKS"
		EBX = ???
		ECX = ???
	    AL = 02h set ???
		BL = logical page number for ??? (00h-03h)
		Return: AH = status (00h,8Ah)
	AH = 22h (v7.00) call ??? for every load module
	    AL = which function to call
		00h call ???
		else call ????
	    Return: AH = 00h
	    Note: if AL=00h, calls the protected-mode function pointed at by
		the DWORD at offset 22h from the start of each module installed
		by a LOAD= directive; if AL<>00h, it calls the function
		pointed at by the DWORD at offset 28h of the load module
	AH = 23h (v7.00) ???
	    AL = 00h set ???
		BL = ???
		Return:	AH = 00h or unchanged (depending on ???)
	    AL = 01h set ???
		BL = ???
		BH = ???
		CX = ???
		DX = ??? (on top of stack)
		Return: AH = status (00h if successful, 8Fh once table full)
		Note:	this call adds one entry to an internal table on each
			  call, until the table is full
	    AL = 02h get ???
		CX = size of buffer
		ES:DI -> buffer for ??? (60 bytes total data)
		Return: CX = number of bytes actually returned
		Note:	returns the array storing the values set with AX=2301h
		Format of one entry in array:
		Offset	Size	Description
		 00h	BYTE	??? (BL from subfn 01h)
		 01h	WORD	??? (CX from subfn 01h)
		 03h	BYTE	??? (BH from subfn 01h)
		 04h	WORD	??? (DX from subfn 01h)
	    AL = 03h set ??? name/path
		ES:DI -> buffer containing ASCIZ ???
	    AL = 04h get ???
		ES:DI -> buffer for ASCIZ ???
	    Note: the ASCIZ string for subfunctions 03h and 04h does not appear
		to be used by 386MAX, and may serve merely for communication
		between two other Qualitas programs
	AH = 24h (v7.00) high memory control
	    AL = 00h get high memory state
		Return: BX = current state
			    00h high memory removed from DOS memory chain
			    01h high memory included in DOS memory chain
	    AL = 01h set high memory state
		BX = new state
		    00h high memory removed from DOS memory chain
		    01h high memory included in DOS memory chain
		    else
			Return: ??? (error, but return varies according to ???)
	AH = 25h (v7.00) remove high RAM from DOS memory chain
	AH = 26h (v7.00) ???
	    BX = ???
	    CX = ???
	    SI = ???
	    DI = ???
	    Return: AH = status
		    BX = ???
		    CX = ???
	AH = 27h (v7.00) ???
	    AL = 00h get ???
		Return: BX = number of paragraphs for ???
	    AL = 01h ???
		BX = ???
		ES??? = ???
	    AL = 02h ???
		???
	    AL = 03h ???
		CX = ???
		DX = ???
		ES??? = ???
		Return: ???
	AH = 28h (v7.00) get ???
		Return: AH = status (00h,8Fh) (see #2253 at INT 67/AH=40h)
			if AH=00h,
			    CX = ???
			    DX = ???
	AH = 29h (v7.00) get ???
		Return: AX = ???
	AH = 40h-5Dh EMS services (see INT 67/AH=40h etc)
	AH = DEh VCPI services (see INT 67/AX=DE00h etc)
Return: AH = status (as for EMS INT 67 calls)
	    00h successful
	    80h internal error
	    81h hardware malfunction
	    83h invalid handle
	    84h	undefined function
	    8Ah invalid logical page nuber
	    8Bh illegal physical page number
	    8Fh undefined subfunction
	    A4h access denied
	    etc.
	STACK popped (value placed in DX if no specific return value for DX)

Format of 386MAX memory speed record:
Offset	Size	Description	(Table 0702)
 00h	DWORD	page table entry for 4K page
 04h	WORD	number of microticks (840ns units) required for REP LODSD of
		  entire 4K page

Format of 386MAX memory info [array]:
Offset	Size	Description	(Table 0703)
 00h	DWORD	linear start address
 04h	DWORD	size in bytes
 08h	WORD	XMS handle (if next byte = 04h)
		??? (if next byte = 05h)
		??? (if next byte = 06h)
		??? (if next byte = 13h)
		??? (if next byte = 14h)
		??? (if next byte = 15h)
		??? (if next byte = 23h)
		??? (if next byte = 24h)
		??? (if next byte = 26h)
		else unused
 0Ah	BYTE	type
		00h = ???, 01h = VDISK,
		02h = INT 15h extended memory, 03h = ??? extended,
		04h = XMS handle's memory, 05h = ???, 06h = ???, 07h = ???,
		08h = ???, 09h = ???, 0Ah = ???, 0Bh = ???,
		11h = ???, 12h = ???, 14h = ???, 15h = ???,
		19h = ???, 1Ah = ???, 1Bh = ???,
		1Ch = ???, 1Dh = ???, 1Eh = ???, 1Fh = ???,
		20h = ???, 21h = ???, 23h = ???, 24h = ???,
		26h = ???
 0Bh	BYTE	??? (00h for types 00h-03h, 07h-0Bh, 19h-21h;
		     80h for types 04h/13h-15h/23h-26h;
			??? for type 05h)
--------V-214402-----------------------------
INT 21 - PGS1600.DEV - IOCTL - GET CONFIGURATION INFO
	AX = 4402h
	BX = file handle for device "PGS1600$"
	CX = 0018h (size of buffer)
	DS:DX -> configuration buffer (see #0704)
Return: CF clear if successful
	    buffer filled
	    AX = number of bytes actually copied
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: PGS1600.DEV is a device driver for the Cornerstone Technology PG1600
	  display adapter, which provides a 1600x1200 monochrome display as
	  well as one of two emulations, MDA or CGA.
SeeAlso: AX=4403h"PGS1600"

Format of PGS1600.DEV configuration information:
Offset	Size	Description	(Table 0704)
 00h	WORD	version (high byte = major, low byte = minor)
 02h	WORD	board initialisation mode
 04h	WORD	board I/O address
		03D0h CGA emulation
		03B0h MDA emulation
		0390h no emulation
		0350h no emulation, alternate
 06h	WORD	emulation buffer segment
		B800h	CGA emulation
		B000h	MDA emulation
		0000h	no emulation
 08h	WORD	PG1600 graphics buffer segment
 0Ah	WORD	number of bytes between consecutive graphic rows
 0Ch	WORD	horizontal pixel size
 0Eh	WORD	vertical pixel size
 10h	WORD	horizontal dots per inch
 12h	WORD	vertical dots per inch
 14h	WORD	graphics buffer bits per pixel
 16h	WORD	monitor bits per pixel
--------N-214402-----------------------------
INT 21 - PC/TCP IPCUST.SYS - RESET CONFIGURATION DATA READ POINTER
	AX = 4402h
	BX = file handle referencing device "$IPCUST"
	CX, DS:DX ignored
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Notes:	there are a total of 378h bytes of configuration data for IPCUST.SYS
	  version 2.05.	 If less than the entire data is read or written,
	  the next read/write continues where the previous one ended; this
	  call and AX=4403h both reset the location at which the next
	  operation starts to zero
	v2.1+ uses a new configuration method, but allows the installation
	  of IPCUST.SYS for backward compatibility with other software which
	  must read the PC/TCP configuration
SeeAlso: AH=3Fh"IPCUST",AH=40h"IPCUST",AX=4403h"IPCUST"
--------N-214402-----------------------------
INT 21 - WORKGRP.SYS - GET API ENTRY POINT
	AX = 4402h
	BX = file handle for device "NET$HLP$"
	CX = 0008h
	DS:DX -> buffer for entry point record (see #0705)
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code
Program: WORKGRP.SYS is the portion of Microsoft's Workgroup Connection which
	  permits communication with PCs running Windows for Workgroups or
	  LAN Manager
SeeAlso: AH=3Fh"WORKGRP.SYS"

Format of WORKGRP.SYS entry point record:
Offset	Size	Description	(Table 0705)
 00h	WORD	3633h  \ signature???
 02h	WORD	EF6Fh  /
 04h	DWORD	address of entry point (see #0706)
Note:	first four bytes of buffer must be 6Fh E9h 33h 36h on entry when using
	  IOCTL rather than READ to get the entry point record

(Table 0706)
Call WORKGRP entry point with:
	STACK:	WORD	function number (0000h-0009h)
Return: STACK unchanged
SeeAlso: #0707,#0708,#0709,#0710,#0711,#0712,#0713,#0714

(Table 0707)
Call WORKGRP function 00h with:
	STACK:	WORD	0000h (function "get ???")
Return: DX:AX -> data table

(Table 0708)
Call WORKGRP function 01h with:
	STACK:	WORD	0001h (function "hook ???")
Return: STACK:	DWORD	pointer to ???
		WORD	0001h (function number)

(Table 0709)
Call WORKGRP function 02h with:
	STACK:	WORD	0002h (function "unhook ???")
	???
Return: ???

(Table 0710)
Call WORKGRP function 03h with:
	STACK:	WORD	0003h (function "reenable printer port")
		WORD	LPT port number
Return: ???

(Table 0711)
Call WORKGRP function 04h with:
	STACK:	WORD	0004h (function "disable printer port")
		WORD	LPT port number
Return: ???

(Table 0712)
Call WORKGRP function 05h with:
	STACK:	WORD	0005h (function "???")
		???
Return: ???

(Table 0713)
Call WORKGRP function 06h with:
	STACK:	WORD	0006h (function "???")
Return: STACK unchanged
	AX = 0000h
	DX = 0000h

(Table 0714)
Call WORKGRP functions 07h-09h with:
	STACK:	WORD	0007h-0009h (NOP functions)
Return: STACK unchanged
	AX = 0001h
	DX = 0000h
--------N-214402-----------------------------
INT 21 - 10NET v5.0 - 10BEUI.DOS - API
	AX = 4402h
	BX = file handle referencing device "10BEUI$"
	DS:DX -> parameter record (see #0715)
	CX ignored
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4402h"10MEMMGR",INT 6F/AH=00h"10NET"

Format of 10NET 10BEUI.DOS parameter record:
Offset	Size	Description	(Table 0715)
 00h	WORD	000Ah (function number???)
 02h	WORD	???
 04h	DWORD	pointer to buffer for ???
 08h  4 BYTEs	???
 0Ch	WORD	transfer size
--------N-214402-----------------------------
INT 21 - 10NET v5.0 - 10MEMMGR.SYS - API
	AX = 4402h
	BX = file handle referencing device "MEMMGR0$"
	DS:DX -> 6-byte buffer for interface info (see #0716)
	CX ignored
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4402h"10BEUI",INT 6F/AH=00h"10NET"

Format of 10NET 10MEMMGR.SYS interface info:
Offset	Size	Description	(Table 0716)
 00h	DWORD	address of entry point (see #0717)
 04h	WORD	version (0500h for v5.00)

(Table 0717)
Call 10NET 10MEMMGR.SYS entry point with:
	AL = 01h ???
	    BX = ???
	    Return: CF clear if successful
		    CF set on error
			AX = error code
	AL = 02h ???
	    ???
	AL = 03h ???
	    ???
	AL = 04h set/restore memory allocation strategy
	    BX = subfunction
		0000h set strategy
		0001h restore strategy
	    Return: CF clear if successful
		    CF set on error (if function disabled)
		    various registers destroyed
	AL = other
	    Return: CF set
		    AX = 0000h
		    BL = 01h
--------V-214402-----------------------------
INT 21 - Compaq AG1024.SYS - RGDI - GET DRIVER LOCATION
	AX = 4402h
	BX = file handle for device "$$$$RGDI"
	CX = 0006h (size of returned data)
	DS:DX -> location record (see #0718)
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: AG1024.SYS is a device driver for the Advanced Graphics 1024 adapter
SeeAlso: AX=4403h"RGDI"

Format of Compaq AG1024.SYS location record:
Offset	Size	Description	(Table 0718)
 00h	WORD	signature 55AAh
 02h	WORD	segment of ???
 04h	WORD	segment of device driver's code
--------N-214402-----------------------------
INT 21 - FTPSOFT.DOS v3.1 - GET ???
	AX = 4402h
	BX = file handle for device "FTPSOFT$"
	CX = size of buffer
	DS:DX -> buffer for data (see #0719)
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: FTPSOFT.DOS is a device driver for Protocol Manager support from
	   FTP Software, Inc.
SeeAlso: AH=3Fh"PC/TCP",AX=4402h"NDIS"

Format of FTPSOFT.DOS data:
Offset	Size	Description	(Table 0719)
 00h	WORD	(call) BA98h (if different, no data returned)
 02h	DWORD	-> NDIS common characteristics table
		  (see #0658 at AX=4402h"NDIS")
 06h	DWORD	(call) -> new dispatch table (see #0660 at AX=4402h"NDIS")
 0Ah	DWORD	-> 28-byte buffer for ??? data
 0Eh	DWORD	???
 12h	DWORD	-> FAR function to reset dispatch jump table to defaults
 16h	BYTE	???
Note:	the addresses in the new dispatch table are copied into an internal
	  jump table which may be reset by calling the function pointed at by
	  offset 12h
--------n-214402-----------------------------
INT 21 U - PenDOS PENDEV.SYS - GET ENTRY POINTS
	AX = 4402h
	BX = file handle for device "$$PENDOS" or "$$PD_REG"
	CX = size of buffer (4 for $$PENDOS and a 4,8,12, or 16 for $$PD_REG)
	DS:DX -> buffer for entry point record (see #0720)
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: A limited version of PenDOS by Communication Intelligence Corporation,
	  which provides pen capability to keyboard-based programs, is bundled
	  with IBM DOS 6.1
SeeAlso: AX=4403h"PENDEV.SYS"

Format of PENDEV.SYS entry point record:
Offset	Size	Description	(Table 0720)
 00h	DWORD	-> array of jumps
 04h	WORD	offset of function to retrieve entry point (see #0721)
 06h  2 BYTEs	signature "Pe"
 08h	WORD	offset of function to set entry point (see #0722)
 0Ah  2 BYTEs	signature "nD"
 0Ch	WORD	offset of function to clear entry point (see #0723)
 0Eh	WORD	signature "OS"

(Table 0721)
Call PENDEV.SYS function to retrieve entry point with:
	AX = index of entry point (0-9)
Return: CF clear if successful
	    DX:AX -> desired entry point
	CF set on error (AX out of range)

(Table 0722)
Call PENDEV.SYS function to set entry point with:
	AX = index of entry point (0-9)
	DX:SI -> new handler
Return: CF clear if successful
	CF set on error (AX out of range)

(Table 0723)
Call PENDEV.SYS function to clear entry point with:
	AX = index of entry point (0-9)
Return: CF clear if successful
	CF set on error (AX out of range)
Note:	resets the jump at the specified entry point to its default target,
	  which simply returns
--------N-214402-----------------------------
INT 21 U - LAN Manager - TCPDRV.DOS - API
	AX = 4402h
	BX = file handle referencing device "TCPDRV$"
	CX = 0019h
	DS:DX -> buffer containing request block (see #0724)
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: TCPDRV.DOS is the low-level device driver supporting LAN Manager's
	  TCP/IP protocol stack

Format of TCPDRV.DOS request block:
Offset	Size	Description	(Table 0724)
 00h	BYTE	(call) function number
		00h initialize ???
		06h get ???
		07h get ???
 01h	BYTE	(call) 00h
		(ret) error code if error, unchanged if successful
 02h	WORD	signature 4354h ('CT')
---function 00h---
 04h	DWORD	(call) pointer to ??? FAR function
		function is called with ES:BX -> device driver request used to
		  invoke this function
 08h  4 BYTEs	???
 0Ch	DWORD	(call) pointer to ??? record, WORD at offset 22h is read
 10h	DWORD	(ret) -> ??? buffer if 0000h:0000h on call
---function 06h---
 04h  4 BYTEs	???
 08h	DWORD	(ret) pointer to ???
---function 07h---
 04h	DWORD	(ret) pointer to ??? record
--------y-214402-----------------------------
INT 21 U - PC Tools 9 CPRLOW.EXE - GET CODE AND DATA ADDRESSES
	AX = 4402h
	BX = file handle referencing device "RECLOWLD"
	DS:DX -> buffer for address list (see #0725)
	CX ignored
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)

Format of CPRLOW address list:
Offset	Size	Description	(Table 0725)
 00h	WORD	segment of CPRLOW code
 02h	WORD	offset in code segment of ??? entry point
		(switches into protected mode)
 04h	WORD	offset in code segment of jump array (see #0726)
 06h	WORD	segment of copy of interrupt vector table at CPRLOW load time
Note:	neither the entry point nor the jump array is valid until after a
	  CPR /LOAD, because CPR.EXE installs the code into CPRLOW at runtime.

Format of CPRLOW jump array:
Offset	Size	Description	(Table 0726)
 00h  3 BYTEs	initialize CPRLOW interrupt hooks
 03h  3 BYTEs	reset timers and enable CPR (hotkey enable)
 06h  3 BYTEs	disable CPR (hotkey disable)
 09h  3 BYTEs	clear ??? flag, hotkey disable, and ???
 0Ch  3 BYTEs	initialize delay loop counter (destroys AX,BX,CX,DX)
 0Fh  3 BYTEs	disable CPR completely (commandline /DISABLE)
 12h  3 BYTEs	enable ??? if CPR enabled by both cmdline and hotkey
 15h  3 BYTEs	enable CPR (commandline /ENABLE)
--------s-214402-----------------------------
INT 21 U - Creative Technology CTMMSYS.SYS v1.00.01 - API
	AX = 4402h
	BX = file handle for device "CTMMSYS$"
	CX = 0004h (size of data)
	DS:DX -> buffer for entry point (see #0727)
Return: CF clear if successful
	    buffer updated
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: CTMMSYS.SYS is the Creative DOS Multimedia Architecture Integration
	  driver
SeeAlso: AX=4402h"CTSB2",INT 80/BX=0000h"SBFM"

Format of CTMMSYS.SYS entry point record:
Offset	Size	Description	(Table 0727)
 00h	DWORD	(call) signature 4D6D7443h (ASCII "CtmM")
		(ret) pointer to CTMMSYS entry point (see #0728)
SeeAlso: #0729

(Table 0728)
Call CTMMSYS.SYS entry point with:
	AX = ???
	STACK:	WORD	???
		WORD	???
		WORD	??? (0001h,0002h,0005h,0006h)
		WORD	???
		DWORD	-> ???
		WORD	???
		WORD	???
Return: DX:AX = ??? or error code
		0000h:000Bh invalid value for ???
		0000h:000Fh API call already in progress
SeeAlso: #0727
--------s-214402-----------------------------
INT 21 U - Creative Technology CTSB2.SYS v1.01.01 - API
	AX = 4402h
	BX = file handle for device "CTSOUND0"
	CX = 0004h (size of data)
	DS:DX -> buffer for entry point (see #0729)
Return: CF clear if successful
	    buffer updated
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: CTMMSYS.SYS is the Creative DOS Multimedia Architecture Integration
	  driver
SeeAlso: AX=4402h"CTMMSYS",INT 80/BX=0000h"SBFM"

Format of CTSB2.SYS entry point record:
Offset	Size	Description	(Table 0729)
 00h	DWORD	(call) signature 4D6D7443h (ASCII "CtmM")
		(ret) pointer to CTSB2 entry point (see #0730)
SeeAlso: #0727

(Table 0730)
Call CTSB2.SYS entry point with:
	AX = ???
	STACK:	DWORD	-> ???
		WORD	function number
			(0100h,0200h,0300h,0400h,0500h,0600h,0701h)
		DWORD	-> ???
		WORD	???
		WORD	???
Return: DX:AX = ??? or error code
		0000h:0004h invalid subfunction???
		0000h:000Bh invalid value for ???
		0000h:000Fh API call already in progress
SeeAlso: #0729
--------m-214402-----------------------------
INT 21 U - Novell DOS 7 EMM386.EXE - GET STATE RECORD???
	AX = 4402h
	BX = file handle for device "EMMXXXX0"
	CX = 003Eh (size of state record)
	DS:DX -> buffer for state record (see #0731)
Return: CF clear if successful
	    buffer filled (see #2208 at INT 67/AH=3Fh)
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)

Format of Novell DOS 7 EMM386.EXE state record:
Offset	Size	Description	(Table 0731)
 00h	WORD	signature EDC0h
 02h 60 BYTEs	???
--------m-214402SF00-------------------------
INT 21 U - Memory Managers - GET API ENTRY POINT
	AX = 4402h subfn 00h
	BX = file handle for device "EMMXXXX0"
	CX = 0006h (size of buffer in bytes)
	DS:DX -> buffer for API entry point record (see #0732)
		first byte must be 00h on entry
Return: CF clear if successful
	    buffer filled (see #2208 at INT 67/AH=3Fh)
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Notes:	this function is supported by Microsoft EMM386.EXE v4.45+ and
	  CEMM v5.10+, and is intended for use by MS Windows as it starts up
	if no other program has hooked INT 67, an alternate installation
	  check for CEMM is testing for the string
	  "COMPAQ EXPANDED MEMORY MANAGER 386" at offset 14h in the INT 67
	  handler's segment; if present, the word at offset 12h contains the
	  offset of the API entry point
SeeAlso: AX=4402h/SF=01h,AX=4402h/SF=02h,AX=4402h"EMM386",INT 67/AH=3Fh

Format of memory manager API entry point record:
Offset	Size	Description	(Table 0732)
 00h	WORD	??? (0022h for CEMM 5.11, 0025h for MS EMM386 v4.45)
 02h	DWORD	manager's private API entry point
		(see #0733,#2271 at INT 67/AX=FFA5h)

(Table 0733)
Call CEMM v5.10+ entry point with:
	AH = 00h get memory manager's state
	    Return: AH = state
			bit 0: turned OFF
			bit 1: AUTO mode enabled
	AH = 01h set memory manager's state
	    AL = new state (00h ON, 01h OFF, 02h AUTO)
	    Return: CF clear if successful
		    CF set on error
	AH = 02h Weitek coprocessor support
	    AL = subfunction
		00h get Weitek support state
		    Return: AL = status
				bit 0: Weitek coprocessor is present
				bit 1: Weitek support is enabled
		01h turn on Weitek support
		02h turn off Weitek support
	    Return: CF clear if successful
		    CF set on error
			AH = error code (01h invalid subfunc, 02h no Weitek)
	AH = 05h get statistics
	    ???
	AH > 06h
	    Return: CF set
		    AH = 01h (invalid function)
Notes:	AH=03h,04h,06h are NOPs which return CF clear, presumably for backwards
	  compatibility with earlier versions of CEMM
	in v5.11, AH=05h merely prints an error message (using INT 21/AH=09h)
	  stating that a different version of CEMM is installed and it is
	  therefore not possible to display the statistics
--------m-214402SF01-------------------------
INT 21 U - Memory Managers - GET EMM IMPORT STRUCTURE ADDRESS
	AX = 4402h subfn 01h
	BX = file handle for device "EMMXXXX0"
	CX = 0006h (size of buffer in bytes)
	DS:DX -> buffer for EMM import structure record (see #0734)
		first byte must be 01h on entry
Return: CF clear if successful
	    buffer filled (see also #2208 at INT 67/AH=3Fh)
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Notes:	this function is supported by Microsoft EMM386.EXE v4.45+,
	  QEMM-386 v6+, and CEMM v5.10+, and is intended for use by MS Windows
	  as it starts up
	for QEMM-386, this call always returns an error if Windows3 support
	  has been disabled with the NW3 switch
SeeAlso: AX=4402h/SF=00h,AX=4402h"EMM386",INT 2F/AX=D201h/BX=5145h
SeeAlso: INT 67/AH=3Fh

Format of EMM import structure record:
Offset	Size	Description	(Table 0734)
 00h	DWORD	physical address of EMM import structure (see #0735)
 04h	BYTE	EMM import structure major version
 05h	BYTE	EMM import structure minor version
Note:	version 1.00 contains only EMS information (Windows 3.0+)
	version 1.10 contains UMB/XMS/HMA/EMS information (Windows 3.1)
	version 1.11 is version 1.10 plus memory manager maker/product name
SeeAlso: #2248

Format of Global EMM Import record:
Offset	Size	Description	(Table 0735)
 00h	BYTE	bit flags
		bit 2: ???
		bit 3: free EMM386 virtual HMA only if hma_page_table_paddr!=0
		bit 4: no UMB???
 01h	BYTE	reserved (0)
 02h	WORD	size of structure in bytes
 04h	WORD	structure version
 06h	DWORD	reserved
 0Ah 384 BYTEs	64 EMS frame status records (see #0736), one per 16K of
		  real-mode 1M address space
18Ah	BYTE	??? (must be at least 3*number_of_EMS_frames+4)
18Bh	BYTE	number of UMB frame descriptors following
18Ch 4N DWORDs	UMB frame descriptors
		each is 4 DWORDs giving physical page numbers for the four
		  4K pages of a 16K EMS frame (00000000h if non-UMB page)
var	BYTE	number of EMS handle info records following
    16N BYTEs	EMS handle info records (see #0738)
---version 1.10+ ---
	DWORD	realmode INT 67 vector (used by Windows to set breakpoints)
	DWORD	physical address of HMA page table values
	BYTE	number of free page entries following
     2N DWORDs	free page entries
		each is:
		    DWORD	physical page number
		    DWORD	number of consecutive physical pages
	BYTE	number of XMS handle info records following
		00h if memory manager does not emulate XMS or has real mode
		  XMS code which can execute in the Windows environment
    12N BYTEs	XMS handle info records (see #0739)
	BYTE	number of free UMB info records following
     2N WORDs	free UMB info records
		each is:
		    WORD	real mode start segment
		    WORD	size in paragraphs
---version 1.11---	
     20 BYTEs	blank-padded maker name
     20 BYTEs	blank-padded product name

Format of EMS frame status record:
Offset	Size	Description	(Table 0736)
 00h	BYTE	frame type (see #0737)
 01h	BYTE	owner handle (00h/FFh = none) from frame including UMB
		index to UMB frame descriptors
 02h	WORD	logical page for frame, 7FFFh if none, FFFFh if non-EMS frame
 04h	BYTE	EMS physical page number (FFh for non-EMS = don't care???)
 05h	BYTE	flags for non-EMS frames (00h for EMS frame)
		bits 0,1 for first 4K, bits 2,3 for second 4K, etc:
		  10: direct mapping (linear address = physical address)
		  01: UMB mapping

Bitfields for EMS frame type:
Bit(s)	Description	(Table 0737)
 0	EMS frame
 1	(if EMS frame) in standard 64K page frame
 2	first 4K of frame is UMB
 3	second 4K of frame is UMB
 4	third 4K of frame is UMB
 5	last 4K of frame is UMB

Format of EMS handle info record:
Offset	Size	Description	(Table 0738)
 00h	BYTE	handle number (00h = system handle)
 01h	BYTE	flags
		bit 0: normal handle rather than system handle
		bit 2: ??? (set by some EMS managers)
 02h  8 BYTEs	EMS handle's name
 0Ah	WORD	number of 16K pages for handle
 0Ch	DWORD	physical address of page table entries forming page map
Note:	all values should be zero for the system handle if no large frame
	  support is present

Format of XMS handle info record:
Offset	Size	Description	(Table 0739)
 00h	WORD	handle
 02h	WORD	flags
		bit 0: handle usable by Windows
			(already in use when Windows started if clear)
		bit 1: reserved (0)
 04h	DWORD	size in KB (may be zero, used only if flags bit 0 set)
 08h	DWORD	physical address (only if flags bit 0 set)
--------m-214402SF02-------------------------
INT 21 U - Memory Managers - GET MEMORY MANAGER VERSION
	AX = 4402h subfn 02h
	BX = file handle for device "EMMXXXX0"
	CX = 0002h (size of buffer in bytes)
	DS:DX -> buffer for memory manager version (see #0740)
		first byte must be 02h on entry
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	this function is supported by Microsoft EMM386.EXE v4.45+ and
	  CEMM v5.10+, and is intended for use by MS Windows as it starts up
SeeAlso: AX=4402h/SF=00h,AX=4402h"EMM386",INT 67/AH=3Fh

Format of memory manager version:
Offset	Size	Description	(Table 0740)
 00h	BYTE	major version
 01h	BYTE	minor version (binary)
--------m-214402-----------------------------
INT 21 U - Microsoft EMM386.EXE v4.45 - GET MEMORY MANAGER INFORMATION
	AX = 4402h
	BX = file handle for device "EMMXXXX0"
	CX = size of buffer in bytes (varies, see #0741)
	DS:DX -> buffer for returned data (see #0741)
		first byte must be set on entry to indicate desired data
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Notes:	an error is returned if the number of bytes to be read does not match
	  the number of bytes returned for the specified data item
	this function is part of the interface which allows MS Windows to
	  cooperate with memory managers
SeeAlso: AX=4402h/SF=00h,AX=4402h/SF=01h,AX=4402h/SF=02h,INT 67/AX=FFA5h

Format of EMM386.EXE data buffer:
Offset	Size	Description	(Table 0741)
 00h	BYTE	(call) function
		03h get ???
		04h get ???
---function 03h---
 00h	WORD	???
 02h	WORD	???
---function 04h---
 00h	WORD	segment of UMB containing EMM386 code/data
 02h	WORD	number of paragraphs of EMM386 code/data in UMB
 04h	WORD	???
----------214402-----------------------------
INT 21 U - IFSHLP.SYS - GET ENTRY POINT
	AX = 4402h
	BX = file handle for device "IFS$HLP$"
	CX = 0008h (size of buffer in bytes)
	DS:DX -> buffer for entry point record (see #0639 at AH=3Fh"IFSHLP")
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AH=3Fh"IFSHLP"
--------D-214403-----------------------------
INT 21 - DOS 2+ - IOCTL - WRITE TO CHARACTER DEVICE CONTROL CHANNEL
	AX = 4403h
	BX = file handle referencing character device
	CX = number of bytes to write
	DS:DX -> data to write
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Notes:	format of data is driver-specific (see below for some specific cases)
	if the file handle refers to "4DOSSTAK", the 4DOS (v2.x-3.03)
	  KEYSTACK.SYS driver will push the specified characters on the
	  keyboard stack; similarly for "NDOSSTAK", the NDOS KEYSTACK.SYS
	  driver will push the characters onto the keyboard stack
SeeAlso: AX=4400h,AX=4402h,AX=4405h,INT 2F/AX=122Bh,INT 2F/AX=D44Dh
SeeAlso: INT 2F/AX=D44Fh
--------c-214403-----------------------------
INT 21 - SMARTDRV.SYS v3.x only - IOCTL - CACHE CONTROL
	AX = 4403h
	BX = handle for device "SMARTAAR"
	CX = number of bytes to write
	DS:DX -> SMARTDRV control block (see #0743)
Return: CF clear if successful
	    AX = number of bytes actually written
		0000h if control block too small for given command
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4402h"SMARTDRV",INT 2F/AX=4A10h/BX=0000h

(Table 0742)
Values for SMARTDRV function code:
 00h	flush cache
 01h	flush and discard cache
 02h	disable caching (flushes and discards cache first)
 03h	enable caching
 04h	control write caching
 05h	set flushing tick count
 06h	lock cache contents
 07h	unlock cache contents
 08h	set flush-on-reboot flag
 09h	unused
 0Ah	control full-track caching
 0Bh	reduce cache size
 0Ch	increase cache size
 0Dh	set INT 13 chain address

Format of SMARTDRV control block:
Offset	Size	Description	(Table 0743)
 00h	BYTE	function code (see #0742)
---functions 00h-03h,06h,07h---
 no additional fields
---function 04h---
 01h	BYTE	write caching control action
		00h turn off write-through
		01h turn on write-through
		02h turn off write buffering (also flushes cache)
		03h turn on write buffering (also flushes cache)
---function 05h---
 01h	WORD	number of timer ticks between cache flushes
---function 08h---
 01h	BYTE	new flush-on-reboot flag (00h off, 01h on)
---function 0Ah---
 01h	BYTE	full-track writes are
		00h not cached
		01h cached
---functions 0Bh,0Ch---
 01h	WORD	number of 16K pages by which to increase/reduce cache size
---function 0Dh---
 01h	DWORD	new address to which to chain on INT 13
Note:	the previous address is not preserved
--------d-214403-----------------------------
INT 21 - CD-ROM device driver - IOCTL OUTPUT
	AX = 4403h
	BX = file handle referencing character device for CD-ROM driver
	CX = number of bytes to write
	DS:DX -> control block (see #0744)
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4402h"CD-ROM",INT 2F/AX=0802h

Format of CR-ROM control block:
Offset	Size	Description	(Table 0744)
 00h	BYTE	function code
		00h eject disk
		01h lock/unlock door
		02h reset drive
		03h control audio channel
		04h write device control string
		05h close tray
---functions 00h,02h,05h---
 no further fields
---function 01h---
 01h	BYTE	lock function
		00h unlock door
		01h lock door
---function 03h---
 01h	BYTE	input channel (0-3) for output channel 0
 02h	BYTE	volume for output channel 0
 03h	BYTE	input channel (0-3) for output channel 1
 04h	BYTE	volume for output channel 1
 05h	BYTE	input channel (0-3) for output channel 2
 06h	BYTE	volume for output channel 2
 07h	BYTE	input channel (0-3) for output channel 3
 08h	BYTE	volume for output channel 3
Note:	output channels 0 and 1 are left and right, 2 and 3 are left prime and
	  right prime; a volume of 00h is off
---function 04h---
 01h  N BYTEs	bytes to send directly to the CD-ROM drive without
		  interpretation
--------d-214403-----------------------------
INT 21 - Brian Antoine Seagate ST-01 SCSI.SYS - IOCTL - EXECUTE COMMANDS
	AX = 4403h
	BX = handle for device "SCSITAPE"
	CX = number of bytes to write
	DS:DX -> SCSITAPE control block (see #0745)
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4405h"ST-01",INT 78/AH=10h

Format of SCSITAPE control block:
Offset	Size	Description	(Table 0745)
 00h	WORD	command type
		'F' Format (argument 1 = interleave, argument 2 = format type)
		'E' Erase
		'R' Rewind
		'L' Load
		'N' No Load
		'S' Space (argument 1 = count, argument 2 = type)
		'M' File Mark (argument 1 = count)
		'A' Reassign
 02h	WORD	argument 1
 04h	WORD	argument 2
 06h	WORD	segment of command buffer
 08h	WORD	offset of command buffer
 0Ah	WORD	length of command buffer
--------E-214403-----------------------------
INT 21 U - AI Architects - OS/x86??? - API
	AX = 4403h
	BX = handle for device "AIA_OS"
	CX = number of bytes to write (ignored)
	DS:DX -> 12-byte buffer (see #0746), first byte is command:
		  81h installation check
		  82h get API entry point
		  84h uninstall
Return: CF clear if successful
	    AX = number of bytes actually written
	    DS:DX buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Ch,0Dh) (see #0885 at AH=59h)
Notes:	these functions are only available if the DOS extender was loaded as a
	  device driver in CONFIG.SYS
	called by TKERNEL (a licensed version of AI Architects/Ergo OS/x86)
SeeAlso: INT 2F/AX=FBA1h/BX=0081h,INT 2F/AX=FBA1h/BX=0082h
Index:	installation check;OS/x86|entry point;OS/x86|uninstall;OS/x86

Format of buffer on return:
Offset	Size	Description	(Table 0746)
 00h  4 BYTEs	signature "IABH"
---if function 81h---
 (no additional fields)
---if function 82h---
 04h	DWORD	pointer to API entry point (see INT 2F/AX=FBA1h/BX=0082h)
---if function 84h---
 04h	WORD	success indicator
 06h	WORD	segment of ???
 08h	WORD	segment of ??? memory block to free if nonzero
 0Ah	WORD	segment of ??? memory block to free if nonzero
--------V-214403-----------------------------
INT 21 - PGS1600.DEV - IOCTL - SET CONFIGURATION???
	AX = 4403h
	BX = file handle for device "PGS1600$"
	CX = 0018h (size of buffer)
	DS:DX -> configuration buffer (see #0704 at AX=4402h"PGS1600")
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: PGS1600.DEV is a device driver for the Cornerstone Technology PG1600
	  display adapter, which provides a 1600x1200 monochrome display as
	  well as one of two emulations, MDA or CGA.
SeeAlso: AX=4402h"PGS1600"
--------N-214403-----------------------------
INT 21 - PC/TCP IPCUST.SYS - RESET CONFIGURATION DATA READ POINTER
	AX = 4403h
	BX = file handle referencing device "$IPCUST"
	CX, DS:DX ignored
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Notes:	there are a total of 378h bytes of configuration data for IPCUST.SYS
	  version 2.05.	 If less than the entire data is read or written,
	  the next read/write continues where the previous one ended; this
	  call and AX=4402h both reset the location at which the next
	  operation starts to zero
	v2.1+ uses a new configuration method, but allows the installation
	  of IPCUST.SYS for backward compatibility with other software which
	  must read the PC/TCP configuration
SeeAlso: AH=3Fh"IPCUST",AH=40h"IPCUST",AX=4402h"IPCUST"
--------V-214403-----------------------------
INT 21 - Compaq AG1024.SYS - CPQ_MGES - IOCTL OUTPUT
	AX = 4403h
	BX = file handle referencing device "CPQ_MGES"
	DS:DX -> request packet (see #0747)
	CX ignored
Return: CF clear if successful
	    AX destroyed
	    data buffer filled (if applicable)
	    first word of request packet set to number of bytes of data
	      available (amount returned is smaller of this and requested
	      amount)
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: AG1024.SYS is a device driver for the Advanced Graphics 1024 adapter
SeeAlso: AX=4403h"RGDI"

Format of Compaq AG1024.SYS request packet:
Offset	Size	Description	(Table 0747)
 00h	WORD	function
		0000h get ??? (26h bytes)
		0001h get ??? (36h bytes)
		0002h set ??? (same as returned by function 0001h)
		0003h get ??? (6 bytes)
		0004h get ???
		0005h get ???
		0006h get ??? (10h bytes)
		0007h set ??? (same as returned by function 0006h)
---functions 00h-03h,06h,07h---
 02h	WORD	size of data buffer
 04h	DWORD	-> buffer for function's data
 ---functions 04h,05h---
 02h	WORD	???
 04h	WORD	size of data buffer
 06h	DWORD	-> buffer to receive data
--------V-214403-----------------------------
INT 21 - Compaq AG1024.SYS - RGDI - IOCTL OUTPUT
	AX = 4403h
	BX = file handle referencing device "$$$$RGDI"
	DS:DX -> request packet (see #0748)
	CX ignored
Return: CF clear if successful
	    AX destroyed
	    data buffer filled (if applicable)
	    first word of request packet set to number of bytes of data
	      available (amount returned is smaller of this and requested
	      amount)
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: AG1024.SYS is a device driver for the Advanced Graphics 1024 adapter
SeeAlso: AX=4402h"RGDI",AX=4403h"CPQ_MGES"

Format of Compaq AG1024.SYS request packet:
Offset	Size	Description	(Table 0748)
 00h	WORD	function
		0000h get entry points
		0001h get ???
 02h	DWORD	address of buffer for returned data
--------m-214403SF01-------------------------
INT 21 U - Qualitas 386MAX v6.01+ - TURN 386MAX OFF
	AX = 4403h subfn 01h
	BX = handle for device "386MAX$$"
	DS:DX -> BYTE 01h
	CX ignored
Return: DS:DX -> BYTE status (00h = successful)
	CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	this function will fail if any EMS or UMBs are in use
SeeAlso: AX=4403h/SF=02h,AX=4403h/SF=03h,AX=4403h/SF=05h
--------m-214403SF02-------------------------
INT 21 U - Qualitas 386MAX v6.01+ - TURN 386MAX ON
	AX = 4403h subfn 02h
	BX = handle for device "386MAX$$"
	DS:DX -> BYTE 02h
	CX ignored
Return: DS:DX -> BYTE status (00h = successful)
	CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4403h/SF=01h,AX=4403h/SF=03h,AX=4403h/SF=05h
--------m-214403SF03-------------------------
INT 21 U - Qualitas 386MAX v6.01+ - SET STATE
	AX = 4403h subfn 03h
	BX = handle for device "386MAX$$"
	CX = number of bytes to copy (up to size of state buffer)
	DS:DX -> BYTE 03h followed by state buffer
		  (see #0687 at AX=4402h"386MAX")
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	the first byte of the buffer must be either 01h, 02h, or 03h
	  (specifying the version of the state record) and the buffer must
	  contain CX bytes AFTER the initial byte
SeeAlso: AX=4402h"386MAX"
--------m-214403SF05-------------------------
INT 21 U - Qualitas 386MAX v7.00+ - LIMIT AUTOMATIC ACTIVATION TO STD EMS CALLS
	AX = 4403h subfn 05h
	BX = handle for device "386MAX$$"
	DS:DX -> BYTE 05h
	CX ignored
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Desc:	specifies that 386MAX will only shift from AUTO to ON mode on standard
	  EMS calls INT 67/AH=40h-5Dh
SeeAlso: AX=4403h/SF=02h,AX=4403h/SF=03h,AX=4403h/SF=06h
--------m-214403SF06-------------------------
INT 21 U - Qualitas 386MAX v7.00+ - ALLOW AUTOMATIC ACTIVATION ON ANY INT 67
	AX = 4403h subfn 06h
	BX = handle for device "386MAX$$"
	DS:DX -> BYTE 06h
	CX ignored
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Desc:	specified that 386MAX should shift from AUTO to ON mode on any INT 67
	  call other than INT 67/AH=3Fh
SeeAlso: AX=4403h/SF=01h,AX=4403h/SF=03h,AX=4403h/SF=05h
--------n-214403-----------------------------
INT 21 U - PenDOS PENDEV.SYS - ???
	AX = 4403h
	BX = file handle for device "$$PENDOS" or "$$PD_REG"
	CX = size of buffer
	DS:DX -> buffer containing ???
Return: CF clear if successful
	    buffer filled
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: A limited version of PenDOS by Communication Intelligence Corporation,
	  which provides pen capability to keyboard-based programs, is bundled
	  with IBM DOS 6.1
Note:	this call sets the WORD at offset 1Ah into the device driver request
	  header used to call the driver to 0000h.
SeeAlso: AX=4402h"PENDEV.SYS"
--------D-214404-----------------------------
INT 21 - DOS 2+ - IOCTL - READ FROM BLOCK DEVICE CONTROL CHANNEL
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc.)
	CX = number of bytes to read
	DS:DX -> buffer
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	format of data is driver-specific
SeeAlso: AX=4402h,AX=4405h,INT 2F/AX=122Bh
--------k-214404-----------------------------
INT 21 - Stacker - GET DEVICE DRIVER ADDRESS AND SET VOLUME NUMBER
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc.)
	CX = 0004h
	DS:DX -> DWORD buffer to receive device driver address
Return: buffer filled with pointer into Stacker device driver (see #1341):
	  driver + 19h if Stacker Anywhere controls this drive
	  driver + 1Ah if Stacker controls this drive
	  unchanged else
Notes:	in addition to returning the address of the Stacker device driver,
	  this call also sets the volume number at offset 58h in the device
	  driver (see #1341 at INT 25/AX=CDCDh)
	Stacker Anywhere does not link its built-in device driver into
	  the standard device driver chain, but it can be found via CDS/DPB
	this call can be used as an installation check for all versions of
	  Stacker and Stacker Anywhere to avoid the INT 25 call
SeeAlso: AX=4408h,AX=440Eh,AH=52h,INT 25/AX=CDCDh
--------k-214404-----------------------------
INT 21 - Stacker - GET STACVOL FILE SECTORS
	AX = 4404h
	BL = drive number (0 is current drive)
	CX = byte count (i.e., 200h = 1 sector)
	DS:DX -> buffer (see #0749)
Return: Data Buffer contains the number of sectors requested from the
	  STACVOL physical file for the drive specified.

Format of Stacker buffer:
Offset	Size	Description	(Table 0749)
 00h	WORD	01CDh
 02h	WORD	sector count
 04h	DWORD	number of starting sector
 08h	DWORD	far pointer to Data Buffer
--------k-214404-----------------------------
INT 21 - DUBLDISK.SYS v2.6 - GET INFO
	AX = 4404h
	BL = drive number of DoubleDisk drive (00h = default, 01h = A:, etc.)
	CX = number of bytes (000Ah-0014h, call ignored otherwise)
	DS:DX -> data record (see #0750)
Return: CF clear if successful
	    AX = number of bytes read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: DUBLDISK.SYS is the device driver portion of DoubleDisk, a disk
	  expander by Vertisoft Systems, Inc.
Note:	the installation check for v2.6 consists of scanning memory for the
	  signature "FAT 2.6  byte:", which is immediately followed by a data
	  table (see #0751)
BUG:	VOPT (a disk optimizer by Golden Bow Software) assumes that any driver
	  which returns the "correct" number of bytes when the first word of
	  the buffer for the data record contains the signature value 4444h is
	  DoubleDisk; a workaround is for the non-DoubleDisk driver to return
	  no data if the signature is present
SeeAlso: AX=440Dh
Index:	installation check;DUBLDISK.SYS

Format of DUBLDISK data record:
Offset	Size	Description	(Table 0750)
 00h	WORD	(call) signature 4444h
 02h	BYTE	(call) function
			00h ???
			01h ???
---function 00h---
 02h	BYTE	(ret) ???
 03h	BYTE	(ret) ???
---function 01h---
 02h	WORD	(ret) 4444h
 04h	WORD	allocation unit size???
 06h	WORD	???
 08h	WORD	???
 0Ah	BYTE	???

Format of DUBLDISK signature data table:
Offset	Size	Description	(Table 0751)
 00h  5 BYTEs	???
 05h	BYTE	first drive number
 06h	BYTE	number of drives
 07h	???
--------k-214404-----------------------------
INT 21 - DBLSPACE.BIN - IOCTL - FLUSH OR INVALIDATE INTERNAL CACHES
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = 000Ah (size of DSPACKET structure)
	DS:DX -> DSPACKET structure (see #0752)
Return: CF clear if IOCTL successful -- check DSPACKET for actual status
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4405h"DBLSPACE",INT 2F/AX=4A11h/BX=0000h

Format of DoubleSpace DSPACKET structure:
Offset	Size	Description	(Table 0752)
 00h	WORD	signature 444Dh ("DM")
 02h	BYTE	command code
		46h ('F') flush internal caches
		49h ('I') flush and invalidate internal caches
 03h	WORD	result code
		(ret) 4F4Bh ("OK") if successful, else unchanged
 05h  5 BYTEs	padding
--------k-214404-----------------------------
INT 21 - DBLSPACE.BIN v6.2 - IOCTL - GET ??? FOR SPECIFIED DRIVE
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = size of DSPACKET structure (ignored in DOS 6.2)
	DS:DX -> DSPACKET structure (see #0753)
Return: CF clear if IOCTL successful -- check DSPACKET for actual status
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4405h"DBLSPACE",INT 2F/AX=4A11h/BX=0000h

Format of DoubleSpace DSPACKET structure:
Offset	Size	Description	(Table 0753)
 00h	WORD	signature 444Dh ("DM")
 02h	BYTE	command code
		53h ('S') get ??? for specified drive
 03h	WORD	result code
		(ret) 4F4Bh ("OK") if successful, else unchanged
 05h	DWORD	(ret) pointer to 96-byte ??? data
 09h	DWORD	(ret) pointer to ??? data
 0Dh  3 BYTEs	reserved
----------214404-----------------------------
INT 21 U - DoubleTools v1.0 - GET ???
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = 0006h
	DS:DX -> DoubleTools structure (see #0754)
Return: CF clear if IOCTL successful -- check DSPACKET for actual status
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	the Transporter device driver has the signature 55h 61h 50h 74h
	  ("DaPt") twelve bytes after it beginning
	
Format of DoubleTools structure:
Offset	Size	Description	(Table 0754)
 00h	WORD	(call) signature 55h AAh
		(ret) signature 78h 70h ("xp")
 02h	WORD	(call) signature 52h 16h
		(ret) ???
 04h	WORD	(ret) segment of driver's DS (same as its PSP)
--------d-214404-----------------------------
INT 21 U - xDISK v3.31 - CONFIGURE
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = 0047h (length of version string)
	DS:DX -> 79-byte buffer for version string and ???
	DS:0081h = commandline containing new switches for driver
Return: CF clear if successful
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: xDISK is a shareware resizeable EMS RAMdisk by FM de Monasterio
SeeAlso: AX=4405h"xDISK",INT 2F/AH=DDh/BX=7844h"xDISK"
--------c-214404-----------------------------
INT 21 - COMBI-disk v1.13 - GET DATA RECORD
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = 0032h (length of data packet)
	DS:DX -> buffer for data packet (see #0755)
Return: CF clear if successful
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: COMBI-disk is a shareware combination cache and RAMdisk sharing a
	  single pool of memory by Vadim V. Vlasov
Note:	the installation check consists of scanning the valid drives for one
	  which returns a correctly-sized data packet with the proper
	  signature in the first field
SeeAlso: AX=4405h"COMBI"
Index:	installation check;COMBI-disk

Format of COMBI-disk data packet:
Offset	Size	Description	(Table 0755)
 00h  6 BYTEs	ASCIZ signature "COMBI"
 06h	WORD	version (high byte = major, low = decimal minor version)
 08h	BYTE	current options (see below)
 09h	BYTE	sectors per allocation block
 0Ah	WORD	maximum buffer in KB
 0Ch	WORD	current buffer in KB (less than max if XMS memory being lent)
 0Eh	WORD	total number of allocation blocks
 10h	WORD	current number of allocation blocks
 12h	WORD	number of blocks being used by RAM disk
 14h	WORD	number of blocks being used by cache or unused
 16h	WORD	number of dirty cache blocks
 18h	WORD	number of blocks which could not be written out due to errors
 1Ah	WORD	total number of read requests
 1Ch	WORD	total number of sectors read
 1Eh	WORD	number of BIOS read requests (cache misses)
 20h	WORD	number of sectors read via BIOS (cache misses)
 22h	WORD	total number of write requests
 24h	WORD	total number of sectors written
 26h	WORD	number of BIOS write requests
 28h	WORD	number of sectors written via BIOS
 2Ah	WORD	number of RAM disk read requests
 2Ch	WORD	number of sectors read from RAM disk
 2Eh	WORD	number of RAM disk write requests
 30h	WORD	number of sectors written to RAM disk
--------d-214404-----------------------------
INT 21 - SFS v1.00 - GET CONFIGURATION INFORMATION
	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = 001Ah (length of data packet)
	DS:DX -> buffer for data packet (see #0756)
Return: CF clear if successful
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: SFS (Secure FileSystem) is a shareware encrypting disk driver by
	  Peter C. Gutmann
SeeAlso: AX=4405h"SFS"

Format of SFS data packet:
Offset	Size	Description	(Table 0756)
 00h  4 BYTEs	signature string "SFS1"
 04h	WORD	SFS unit number (0-based)
 06h	WORD	drive on which the SFS volume is mounted
 08h	DWORD	sector offset of logical volume from start of physical volume
		0 if logical volume = physical volume
 0Ch	WORD	flag: 00h = no disk mounted, 01h = disk mounted
 0Eh	WORD	flag: 00h read/write, 01h read-only
 10h	WORD	quick-unmount hotkey (high byte = shift state, low = scan code)
 12h	WORD	auto-unmount time in minutes, or 0000h if already expired, or
		FFFFh if not set
 14h	WORD	time in minutes remaining before auto-unmount
 16h	WORD	internal driver check code
		0000h no error
		0001h driver consistency check failed
		0002h unit consistency check failed
 18h	WORD	disk access mode
		0000h BIOS
		0001h IDE direct access
		0002h SCSI direct access
--------D-214405-----------------------------
INT 21 - DOS 2+ - IOCTL - WRITE TO BLOCK DEVICE CONTROL CHANNEL
	AX = 4405h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = number of bytes to write
	DS:DX -> data to write
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	format of data is driver-specific
SeeAlso: AX=4403h,AX=4404h,INT 2F/AX=122Bh
--------d-214405-----------------------------
INT 21 - Brian Antoine Seagate ST-01 SCSI.SYS - IOCTL - EXECUTE COMMANDS
	AX = 4405h
	BX = drive number (00h = default, 01h = A:, etc)
	CX = number of bytes to write
	DS:DX -> SCSIDISK control block (see also #0745 at AX=4403h"ST-01")
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4403h"ST-01"
--------k-214405-----------------------------
INT 21 U - DBLSPACE.BIN - IOCTL - FLUSH OR INVALIDATE INTERNAL CACHES
	AX = 4405h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = 000Ah (size of DSPACKET structure)
	DS:DX -> DSPACKET structure (see #0757)
Return: CF clear if IOCTL successful -- check DSPACKET for actual status
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	this call is identical to the documented AX=4404h
SeeAlso: AX=4404h"DBLSPACE",INT 2F/AX=4A11h/BX=0000h

Format of DoubleSpace DSPACKET structure:
Offset	Size	Description	(Table 0757)
 00h	WORD	signature 444Dh ("DM")
 02h	BYTE	command code
		46h ('F') flush internal caches
		49h ('I') flush and invalidate internal caches
 03h	WORD	result code
		(ret) 4F4Bh ("OK") if successful, else unchanged
 05h  5 BYTEs	padding
--------d-214405-----------------------------
INT 21 U - xDISK v3.31 - ???
	AX = 4405h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = number of bytes to write
	DS:DX -> buffer containing version string
	???
Return: CF clear if successful
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: xDISK is a shareware resizeable EMS RAMdisk by FM de Monasterio
SeeAlso: AX=4404h"xDISK",INT 2F/AH=DDh/BX=7844h"xDISK"
--------d-214405-----------------------------
INT 21 - COMBI-disk v1.13 - CONTROL COMBI-disk
	AX = 4405h
	BL = drive number (00h = default, 01h = A:, etc) for RAM disk
	CX = number of bytes to write
	DS:DX -> buffer containing command packet (see #0759)
Return: CF clear if successful
	    AX = number of bytes actually transferred
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
SeeAlso: AX=4404h"COMBI"

(Table 0758)
Values for COMBI-disk command code:
 80h	flush cache
 81h	change options byte
 82h	shrink memory
 83h	expand memory
 84h	get dirty block information
 85h	reset write errors
 86h	reset counters

Format of COMBI-disk command packet:
Offset	Size	Description	(Table 0759)
 00h	WORD	version
 02h	BYTE	command code (see #0758)
---command code 80h---
 no additional fields
---command code 81h---
 03h	BYTE	new options byte (see #0760)
---command code 82h---
 03h	WORD	number of KB to release
---command code 83h---
 03h	WORD	number of KB to expand
---command code 84h---
 03h	DWORD	-> buffer for block info (see #0761)
---command code 85h---
 03h	DWORD	block ID
---command code 86h---
 03h	BYTE	which counters to reset
		bit 0: hard disk read counts
		bit 1: hard disk write counts
		bit 2: RAM disk read/write counts
Note:	multiple commands may be placed in a single packet by stringing
	  together as many command/argument pairs as desired

Bitfields for COMBI-disk options byte:
Bit(s)	Description	(Table 0760)
 0	cache off
 1	cache frozen
 2	write caching enabled
 3	delayed writing disabled
 5	fix memory allocation (no XMS lending)
 6	no 'sector not found' error

Format of COMBI-disk block info:
Offset	Size	Description	(Table 0761)
 00h	DWORD	block ID
 04h	BYTE	bitmask of valid sectors in block
 05h	BYTE	bitmask of dirty sectors in block
 06h	BYTE	last error returned by BIOS
 07h	BYTE	number of errors
--------D-214405-----------------------------
INT 21 - SFS v1.00 - DRIVER CONTROL
	AX = 4405h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = number of bytes to write
	DS:DX -> data to write (see #0763)
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Program: SFS (Secure FileSystem) is a shareware encrypting disk driver by
	  Peter C. Gutmann
SeeAlso: AX=4404h"SFS"

(Table 0762)
Values for SFS control function:
 00h	"PACKET_SET_DISKINFO"	 set disk parameters
 01h	"PACKET_SET_KEYINFO"	 set keying information
 02h	"PACKET_SET_READONLY"	 select read/write or read-only
 03h	"PACKET_SET_DRIVENO"	 set drive number to mount
 04h	"PACKET_SET_MOUNTSTATUS" set mount status
 05h	"PACKET_SET_UNMOUNT"	 set/clear quick-unmount hotkey
 06h	"PACKET_SET_TIMEOUT"	 set/clear auto-unmount timeout

Format of SFS control data packet:
Offset	Size	Description	(Table 0763)
 00h	WORD	signature 4330h ('C0')
 02h	WORD	function (see #0762)
---function 00h---
 04h	WORD	sector size in bytes
 06h	BYTE	sectors per cluster
 07h	WORD	number of boot sectors
 09h	BYTE	number of copies of FAT
 0Ah	WORD	size of root directory in entries
 0Ch	WORD	number of sectors on disk, 16-bit
 0Eh	BYTE	media descriptor byte
 0Fh	WORD	sectors per FAT
 11h	WORD	sectors per track
 13h	WORD	number of heads
 15h	DWORD	number of hidden sectors
 19h	DWORD	number of sectors on disk, 32-bit
---function 01h---
 04h 20 BYTEs	master IV for encrypted disk
 18h 64 BYTEs	NDC/SHS keying information
---function 02h---
 04h	WORD	read-only state: 00h read-only, 01h read/write
---function 03h---
 04h	WORD	drive number (see #0764)
 06h	DWORD	sector offset of logical volume from start of physical volume
		0 if logical volume = physical volume
---function 04h---
 04h	WORD	mount status (00h unmounted, 01h mounted)
---function 05h---
 04h	WORD	hotkey (high byte = shift state, low byte = scan code or 00h)
		0000h to disable hotkey
---function 06h---
 04h	WORD	timeout in minutes before automatic unmount
		0000h to disable auto-unmount
Notes:	the data for function 00h corresponds to a DOS BPB (see AH=53h)
	functions 00h, 01h, and 03h automatically unmount the encrypted drive
	unmounting a drive with function 04h also destroys the encryption
	  information in the driver and forces all dirty buffers to be flushed

Bitfields for SFS drive number:
Bit(s)	Description	(Table 0764)
 15-12	drive access mode
	0000 BIOS access
	0001 direct IDE access
	0010 direct SCSI access
---if BIOS access---
 11-8	unused (0)
 7-0	BIOS drive number
---if IDE access---
 11-8	unused (0)
 7-0	IDE drive number
---if SCSI access---
 11-8	SCSI host number
 7-4	SCSI target ID
 3-0	SCSI logical unit number
--------D-214406-----------------------------
INT 21 - DOS 2+ - IOCTL - GET INPUT STATUS
	AX = 4406h
	BX = file handle
Return: CF clear if successful
	    AL = input status
		00h not ready (device) or at EOF (file)
		FFh ready
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	files may not register as being at EOF if positioned there by AH=42h
SeeAlso: AX=4407h,INT 2F/AX=122Bh
--------D-214407-----------------------------
INT 21 - DOS 2+ - IOCTL - GET OUTPUT STATUS
	AX = 4407h
	BX = file handle
Return: CF clear if successful
	    AL = input status
		00h not ready
		FFh ready
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #0885 at AH=59h)
Note:	for DOS 2+, files are always ready for output, even if the disk is
	  full or no media is in the drive
SeeAlso: AX=4406h,INT 2F/AX=122Bh
--------D-214408-----------------------------
INT 21 - DOS 3.0+ - IOCTL - CHECK IF BLOCK DEVICE REMOVABLE
	AX = 4408h
	BL = drive number (00h = default, 01h = A:, etc)
Return: CF clear if successful
	    AX = media type (0000h removable, 0001h fixed)
	CF set on error
	    AX = error code (01h,0Fh) (see #0885 at AH=59h)
Note:	in addition to the normal operation, if Stacker is installed, this
	  call also sets the volume number at offset 58h in the Stacker
	  device driver (except under DR-DOS 3.41-5.0, which do not pass
	  through this call to the driver; use AX=440Eh instead)
	  (see AX=4404h"Stacker",AX=440Eh,INT 25/AX=CDCDh)
SeeAlso: AX=4400h,AX=4404h"Stacker",AX=4409h,INT 2F/AX=122Bh
--------D-214409-----------------------------
INT 21 - DOS 3.1+ - IOCTL - CHECK IF BLOCK DEVICE REMOTE
	AX = 4409h
	BL = drive number (00h = default, 01h = A:, etc)
Return: CF clear if successful
	    DX = device attribute word
		bit 15: drive is SUBSTituted
		bit 12: drive is remote
		bit  9: direct I/O not allowed
	CF set on error
	    AX = error code (01h,0Fh) (see #0885 at AH=59h)
Note:	on local drives, DX bits not listed above are the attribute word from
	  the device driver header (see #0858 at AH=52h); for remote drives,
	  the other bits appear to be undefined for DOS versions prior to 5.0
	  (they are all cleared in DOS 5+)
	checking whether DX=0800h on return appears to be a fairly reliable
	  method for detecting Microsoft's RAMDRIVE, though not for other
	  ramdisks (there appears to be no simple yet foolproof method for
	  detecting ramdisks, although the presence of only a single copy of
	  the FAT and only a single head on non-removable devices is a fairly
	  good indicator)
SeeAlso: AX=4400h,AX=4408h,AX=440Ah,INT 2F/AX=122Bh
--------D-21440A-----------------------------
INT 21 - DOS 3.1+ - IOCTL - CHECK IF HANDLE IS REMOTE
	AX = 440Ah
	BX = handle
Return: CF clear if successful
	    DX = attribute word (as stored in SFT)
		bit 15: set if remote
		bit 14: date/time not set on close
	CF set on error
	    AX = error code (01h,06h) (see #0885 at AH=59h)
Notes:	if file is remote, Novell Advanced NetWare 2.0 returns the number of
	  the file server on which the handle is located in CX
	DR-DOS 3.41 and 5.0 clear all bits of DX except bit 15
SeeAlso: AX=4400h,AX=4409h,AH=52h,INT 2F/AX=122Bh
--------D-21440B-----------------------------
INT 21 - DOS 3.1+ - IOCTL - SET SHARING RETRY COUNT
	AX = 440Bh
	CX = pause between retries (default 1)
	DX = number of retries (default 3)
Return: CF clear if successful
	CF set on error
	    AX = error code (01h) (see #0885 at AH=59h)
Notes:	delay is dependent on processor speed (value in CX specifies number of
	  64K-iteration empty loops to execute)
	if DX=0000h on entry, the retry count is left unchanged
SeeAlso: AH=52h,INT 2F/AX=1224h,INT 2F/AX=122Bh
--------D-21440C-----------------------------
INT 21 - DOS 3.2+ - IOCTL - GENERIC CHARACTER DEVICE REQUEST
	AX = 440Ch
	BX = device handle
	CH = category code (see #0765)
	CL = function number (see #0766)
	DS:DX -> parameter block (see #0767,#0768,#0769,#0770,#0771,#0772)
	SI = parameter to pass to driver (European MS-DOS 4.0, OS/2 comp box)
	DI = parameter to pass to driver (European MS-DOS 4.0, OS/2 comp box)
Return: CF set on error
	    AX = error code (see #0885 at AH=59h)
	CF clear if successful
	    DS:DX -> iteration count if CL=65h
	    SI = returned value (European MS-DOS 4.0, OS/2 comp box)
	    DI = returned value (European MS-DOS 4.0, OS/2 comp box)
Note:	DR-DOS 3.41 and 5.0 return error code 16h on CL=45h,65h if the device
	  does not support a retry counter
SeeAlso: AX=440Dh,INT 2F/AX=0802h,INT 2F/AX=122Bh,INT 2F/AX=14FFh
SeeAlso: INT 2F/AX=1A01h

(Table 0765)
Values for IOCTL category code:
 00h	unknown (DOS 3.3+)
 01h	COMn: (DOS 3.3+)
 03h	CON (DOS 3.3+)
 05h	LPTn:
 9Eh	Media Access Control driver (STARLITE)
 00h-7Fh reserved for Microsoft
 80h-FFh reserved for OEM/user-defined

(Table 0766)
Values for generic character IOCTL function:
 00h	MAC driver Bind (STARLITE) (see #0767)
 45h	set iteration (retry) count (see #0768)
 4Ah	select code page (see #0769)
 4Ch	start code-page preparation (see #0770)
 4Dh	end code-page preparation (see #0771)
 5Fh	set display information (DOS 4+) (see #0772)
 65h	get iteration (retry) count
 6Ah	query selected code page (see #0769)
 6Bh	query prepare list (see #0773)
 7Fh	get display information (DOS 4+) (see #0772)
Note:	bit assignments for function code:
	    bit 7: set to ignore if unsupported, clear to return error
	    bit 6: set if passed to driver, clear if intercepted by DOS
	    bit 5: set if queries data from device, clear if sends command
	    bits 4-0: subfunction

Format of parameter block for function 00h:
Offset	Size	Description	(Table 0767)
 00h  8 BYTEs	ASCIZ signature "STARMAC"
 08h	WORD	version
 0Ah	WORD	flags
		bit 0: media requires connect or listen request before use
		bit 1: network is a LAN (broadcast/multicast supported)
		bit 2: point-to-point network
 0Ch	WORD	handle for use with MAC driver's private interface (filled in
		by MAC driver)
 0Eh	WORD	context
 10h	WORD	approximate speed in KB/sec (filled in by MAC driver)
 12h	WORD	approximate cost in cents per hour (filled in by MAC driver)
 14h	WORD	maximum packet size in bytes (filled in by MAC driver)
 16h	WORD	addressing format (filled in by MAC driver)
		0000h general addressing
		0001h Ethernet addressing
		0002h Token Ring addressing
		0003h Token Bus addressing
 18h	DWORD	Send entry point (filled in by MAC driver)
 1Ch	DWORD	RegisterEventHandler entry point (filled in by MAC driver)
 20h	DWORD	SetPacketFilter entry point (filled in by MAC driver)
 24h	DWORD	UnBind entry point (filled in by MAC driver)

Format of parameter block for function 45h:
Offset	Size	Description	(Table 0768)
 00h	WORD	number of times output is attempted before driver assumes
		  device is busy

Format of parameter block for functions 4Ah and 6Ah:
Offset	Size	Description	(Table 0769)
 00h	WORD	length of data
 02h	WORD	code page ID
 04h 2N BYTEs	DCBS (double byte character set) lead byte range
		  start/end for each of N ranges (DOS 4.0)
	WORD	0000h  end of data (DOS 4.0)

Format of parameter block for function 4Ch:
Offset	Size	Description	(Table 0770)
 00h	WORD	flags
		DISPLAY.SYS = 0000h
		PRINTER.SYS bit 0 clear to prepare downloaded font, set to
			prepare cartridge selection
 02h	WORD	length of remainder of parameter block
 04h	WORD	number of code pages following
 06h  N WORDs	code page 1,...,N

Format of parameter block for function 4Dh:
Offset	Size	Description	(Table 0771)
 00h	WORD	length of data
 02h	WORD	code page ID

Format of parameter block for functions 5Fh and 7Fh:
Offset	Size	Description	(Table 0772)
 00h	BYTE	level (0 for DOS 4.x-6.0)
 01h	BYTE	reserved (0)
 02h	WORD	length of following data (14)
 04h	WORD	control flags
		bit 0 set for blink, clear for intensity
		bits 1-15 reserved
 06h	BYTE	mode type (1=text, 2=graphics)
 07h	BYTE	reserved (0)
 08h	WORD	colors
		0000h = monochrome
		else N bits per pixel
 0Ah	WORD	pixel columns
 0Ch	WORD	pixel rows
 0Eh	WORD	character columns
 10h	WORD	character rows

Format of parameter block for function 6Bh:
Offset	Size	Description	(Table 0773)
 00h	WORD	length of following data
 02h	WORD	number of hardware code pages
 04h  N WORDs	hardware code pages 1,...,N
	WORD	number of prepared code pages
      N WORDs	prepared code pages 1,...,N
--------d-21440C-----------------------------
INT 21 - Greg Shenaut ASPITAPE.SYS - INTERFACE
	AX = 440Ch
	BX = device handle
	CH = category code
	    07h tape (ASPITAPE.SYS)
	CL = function
	    01h "mtop" - perform tape operation
	    02h "mtget" - get tape status
	    03h ignore end-of-tape errors
	    04h enable end-of-tape errors
	DS:DX -> parameter block (see #0774,#0775)
Return: CF set on error
	    AX = error code (see #0885 at AH=59h)
	CF clear if successful
	    DS:DX -> data block
Notes:	This device driver is a simple DOS interface to the Adaptec Advanced
	  SCSI Programming Interface (ASPI).  It provides the following device
	  names as access to the SCSI tape, 'RMTx' (rewind on close) and
	  'NRMTx' (NO rewind on close) where x can go from 0 to 3.  There may
	  also be the following names 'MTx' and 'NMTx' which default to 1024
	  byte blocks.	The names may also have a '$' appended to try and make
	  them unique from file names of 'RMT0' etc.
	once opend these devices must be put into RAW mode
SeeAlso: AX=4402h"ASPI"

Format of ASPITAPE.SYS mtop parameter block:
Offset	Size	Description	(Table 0774)
 00h	WORD	operation code
		00h "MTWEOF" - write an end-of-file record
		01h "MTFSF" - forward space file
		02h "MTBSF" - backward space file
		03h "MTFSR" - forward space record
		04h "MTBSR" - backward space record
		05h "MTREW" - rewind
		06h "MTOFFL" - rewind and unload
		07h "MTNOP" - perform TEST UNIT READY
 02h	DWORD	repetition count

Format of ASPITAPE.SYS mtget parameter block:
Offset	Size	Description	(Table 0775)
 00h	BYTE	ASPI host ID
 01h	BYTE	SCSI target ID
 02h	BYTE	SCSI logical unit number
 03h	BYTE	device parameters
		bit 0: drive must use fixed-block read and write
		bit 7: drive is an ASPI device
 04h	BYTE	current device state (see #0776)
 05h	BYTE	unit number within driver
 06h	WORD	fixed block blocksize
 08h	BYTE	last SCSI status
 09h	BYTE	last SCSI sense key
 0Ah	WORD	last SCSI opcode (packed) (see #0777)
 0Ch	WORD	residual bytes from SCSI opcode

Bitfields for ASPITAPE.SYS current device state:
Bit(s)	Description	(Table 0776)
 0	device currently opened in buffered mode
 1	drive currently opened in nonbuffered mode
 2	rewind drive on last close
 3	drive has been written on
 4	drive has been read from
 5	next read will return 0 bytes
 6	EOM will resemble EOF
 7	drive may be busy rewinding

Bitfields for SCSI opcode:
Bit(s)	Description	(Table 0777)
 0-7	SCSI operation (SCSI packet byte 0)
 8-10	SCSI flags (SCSI packet byte 1)
 11-12	ASPI "Direction Bits" (ASPI SRB byte 3)
--------D-21440D-----------------------------
INT 21 - DOS 3.2+ - IOCTL - GENERIC BLOCK DEVICE REQUEST
	AX = 440Dh
	BL = drive number (00h=default,01h=A:,etc)
	CH = category code (see #0778)
	CL = minor code (function) (see #0779)
	DS:DX -> (DOS) parameter block (see #0780,#0782,#0783,#0784,#0785)
	SI:DI -> (OS/2 comp box) parameter block (see #0786,#0788,#0789,#0790)
Return: CF set on error
	    AX = error code (01h,02h) (see #0885 at AH=59h)
	CF clear if successful
	    DS:DX -> data block if CL=60h or CL=61h
Notes:	DOS 4.01 seems to ignore the high byte of the number of directory
	  entries in the BPB for diskettes.
	functions 46h and 66h undocumented in DOS 4.x, documented for DOS 5+
	the DUBLDISK.SYS v2.6 driver only supports minor codes 60h and 67h
	DR-DOS 3.41-6.0 only support minor codes 40h-42h and 60h-62h; all
	  other minor codes return error code 16h
	some PCMCIA calls reportedly appear to be dangerous for MS-DOS versions
	  prior to 5.0
	minor code 60h normally produces no I/O except with AutoMount=1 for
	  DBLSPACE/DRVSPACE
SeeAlso: AX=440Ch,AH=69h,INT 2F/AX=0802h,INT 2F/AX=122Bh

(Table 0778)
Values for block device IOCTL category code:
 08h	disk drive
 00h-7Fh reserved for Microsoft
 80h-FFh reserved for OEM/user-defined

(Table 0779)
Values for generic block IOCTL minor code:
 00h	(OS/2)	\ used to lock/unlock a drive
 01h	(OS/2)	/
 40h	set device parameters (see #0780)
 41h	write logical device track (see #0782)
 42h	format and verify logical device track (see #0783)
 46h	(DOS 4+) set volume serial number (see #0785,AH=69h)
 47h	(DOS 4+) set access flag (see #0786)
 48h	(Enh. Disk Drive Spec) set media lock state (see #0787,INT 13/AH=45h)
 49h	(Enh. Disk Drive Spec) eject media in drive (see INT 13/AH=49h)
 50h	(PCMCIA) attribute memory write
 51h	(PCMCIA) common memory write
 52h	(PCMCIA) force media change (DOS 5+ ???) (see #0788)
 53h	(PCMCIA) erase drive
 54h	(PCMCIA) erase media
 56h	(PCMCIA) set erase status callback
 57h	(PCMCIA) append Card Information Structure (CIS) tuple
 58h	(PCMCIA) erase CIS tuples
 60h	get device parameters (see #0780)
 61h	read logical device track (see #0782)
 62h	verify logical device track (see #0784)
 66h	(DOS 4+) get volume serial number (see #0785,AH=69h)
 67h	(DOS 4+) get access flag (see #0786)
 68h	(DOS 5+) sense media type (see #0789)
 70h	(PCMCIA) attribute memory read
 73h	(PCMCIA) get memory media information (DOS 5+ ???) (see #0790)
 76h	(PCMCIA) get erase status callback
 77h	(PCMCIA) get first Card Information Structure (CIS) tuple
 78h	(PCMCIA) get next CIS tuple
 7Fh	(PCMCIA) get ??? information (see #0791,#0792)

Format of parameter block for functions 40h, 60h:
Offset	Size	Description	(Table 0780)
 00h	BYTE	special functions
		bit 0 set if function to use current BPB, clear if Device
			  BIOS Parameter Block field contains new default BPB
		bit 1 set if function to use track layout fields only
			must be clear if CL=60h
		bit 2 set if all sectors in track same size (should be set)
		bits 3-7 reserved
 01h	BYTE	device type (see #0781)
 02h	WORD	device attributes
		bit 0 set if nonremovable medium
		bit 1 set if door lock ("changeline") supported
		bits 2-15 reserved
 04h	WORD	number of cylinders
 06h	BYTE	media type
		for 1.2M drive
		    00h 1.2M disk (default)
		    01h 320K/360K disk
		F8h for DUBLDISK.SYS v2.6 expanded drives
		always 00h for other drive types
 07h 31 BYTEs	device BPB (see #0875 at AH=53h), bytes after BPB offset 1Eh
		  omitted
---function 40h only---
 26h	WORD	number of sectors per track (start of track layout field)
		(maximum 63)
 28h  N word pairs: number,size of each sector in track

(Table 0781)
Values for device type:
 00h	320K/360K disk
 01h	1.2M disk
 02h	720K disk
 03h	single-density 8-inch disk
 04h	double-density 8-inch disk
 05h	fixed disk
 06h	tape drive
 07h	(DOS 3.3+) other type of block device, normally 1.44M floppy
 08h	read/write optical disk
 09h	(DOS 5+) 2.88M floppy

Format of parameter block for functions 41h, 61h:
Offset	Size	Description	(Table 0782)
 00h	BYTE	special functions (reserved, must be zero)
 01h	WORD	number of disk head
 03h	WORD	number of disk cylinder
 05h	WORD	number of first sector to read/write
 07h	WORD	number of sectors
 09h	DWORD	transfer address

Format of parameter block for function 42h:
Offset	Size	Description	(Table 0783)
 00h	BYTE	reserved, must be zero (DOS <3.2)
		  bit 0=0: format/verify track
			1: format status call (DOS 3.2+), don't actually format
		  bits 1-7 reserved, must be zero
		value on return (DOS 3.3+):
		  00h	specified tracks, sectors/track supported by BIOS
		  01h	function not supported by BIOS
		  02h	specified tracks, sectors/track not allowed for drive
		  03h	no disk in drive
 01h	WORD	number of disk head
 03h	WORD	number of disk cylinder

Format of parameter block for function 62h:
Offset	Size	Description	(Table 0784)
 00h	BYTE	reserved, must be zero (DOS <3.2)
		  bit 0=0: verify single track
			1: verify multiple tracks
		  bits 1-7 reserved, must be zero
		value on return (DOS 3.3+):
		  00h	specified tracks, sectors/track supported by BIOS
		  01h	function not supported by BIOS
		  02h	specified tracks, sectors/track not allowed for drive
		  03h	no disk in drive
 01h	WORD	number of disk head
 03h	WORD	number of disk cylinder
 05h	WORD	number of tracks to verify (equivalent to 255 or fewer sectors)

Format of parameter block for functions 46h, 66h:
Offset	Size	Description	(Table 0785)
 00h	WORD	(call) info level (should be 0000h)
 02h	DWORD	disk serial number (binary)
 06h 11 BYTEs	volume label or "NO NAME    "
 11h  8 BYTEs	filesystem type "FAT12	 " or "FAT16   " (CL=66h only)

Format of parameter block for functions 47h, 67h:
Offset	Size	Description	(Table 0786)
 00h	BYTE	special-function field (must be zero)
 01h	BYTE	disk-access flag, nonzero if access allowed by driver

Format of parameter block for function 48h:
Offset	Size	Description	(Table 0787)
 00h	BYTE	(call) locking operation
		00h lock media in drive
		01h unlock media
		02h get locking status
 01h	BYTE	(ret) drive's lock status

Format of parameter block for function 52h:
 00h	BYTE	(call) unused???	(Table 0788)
		(ret) 00h if flash/ATA drive but no card inserted
			unchanged otherwise
Notes:	the absense of a flash card should be tested by checking the DOS error
	  code rather than the returned byte
	the parameter byte is cleared to 00h erroneously by the Award
	  PCDISK.EXE v1.02c PCMCIA/ATA driver if no ATA card is inserted
	  (bug corrected in PCDISK.EXE v1.02h and later)
	not supported by the SystemSoft ATADRV.EXE and the Phoenix PCMATA.SYS
	  PCMCIA/ATA drivers

Format of parameter block for function 68h:
Offset	Size	Description	(Table 0789)
 00h	BYTE	01h for default media type, 00h for any other media type
		(see also INT 13/AH=20h"Compaq")
 01h	BYTE	02h for 720K, 07h for 1.44M, 09h for 2.88M

Format of parameter block for function 73h:
Offset	Size	Description	(Table 0790)
 00h	BYTE	???
		00h ATA card inserted ???
		80h ATA card not inserted ???
 01h	BYTE	length of parameter block ???
		apparently always 40h
 02h	BYTE	???
		00h ATA card not inserted ???
		0Dh ATA card inserted ???
 03h  2 BYTEs	??? (apparently always 00h)
 05h	BYTE	drive number (0=first) ???
 06h	BYTE	total number of drives ???
 07h	BYTE	???
		00h ATA card not inserted ???
		01h ATA card inserted ???
 08h 17 BYTEs	???
 19h	BYTE	???
		00h ATA card not inserted ???
		01h ATA card inserted ???
 1Ah	BYTE	??? (apparently always 01h)
 1Bh	BYTE	???
		00h ATA card not inserted ???
		01h ATA card inserted ???
 1Ch  2 BYTEs	??? (apparently always 0015h)
 1Eh  2 BYTEs	???
 20h  2 BYTEs	??? (apparently always 0110h)
 22h 15 BYTEs	???
 31h  2 BYTEs	??? (apparently always 7000h)
 33h 11 BYTEs	driver signature
		"AWARD PDISK" for Award PCDISK.EXE PCMCIA/ATA driver
		"MS-BIOS    " for HP 200LX generic ATA driver
 3Eh  2 BYTEs	???
Notes:	parameter structure possibly depends on driver
	this function is not supported by the SystemSoft ATADRV.EXE and the
	  Phoenix PCMATA.SYS PCMCIA/ATA drivers

Format of parameter block for function 7Fh for SystemSoft ATADRV.EXE:
Offset	Size	Description	(Table 0791)
 00h	DWORD	-> unknown location within driver
Note:	function supported by the SystemSoft ATADRV.EXE PCMCIA/ATA driver
	  but not by the Award PCDISK.EXE PCMCIA/ATA driver
SeeAlso: #0792

Format of parameter block for function 7Fh for Phoenix PCMATA.SYS:
Offset	Size	Description	(Table 0792)
 00h  8 BYTEs	???
Note:	this function supported by the Phoenix PCMATA.SYS PCMCIA/ATA driver
	  but not by the Award PCDISK.EXE PCMCIA/ATA driver
SeeAlso: #0791
--------D-21440E-----------------------------
INT 21 - DOS 3.2+ - IOCTL - GET LOGICAL DRIVE MAP
	AX = 440Eh
	BL = drive number (00h=default,01h=A:,etc)
Return: CF set on error
	    AX = error code (01h,0Fh) (see #0885 at AH=59h)
	CF clear if successful
	    AL = 00h block device has only one logical drive assigned
		 1..26 the last letter used to reference the drive (1=A:,etc)
Notes:	DR-DOS 3.41-5.0 DRIVER.SYS does not support drive mapping and thus
	  always returns AL=00h
	in addition to the normal operation, if Stacker is installed, this
	  call also sets the volume number at offset 58h in the Stacker
	  device driver (DR-DOS 3.41-5.0 only; use AX=4408h otherwise)
	  (see AX=4404h"Stacker",INT 25/AX=CDCDh)
SeeAlso: AX=4408h,AX=440Fh,INT 2F/AX=122Bh
--------D-21440F-----------------------------
INT 21 - DOS 3.2+ - IOCTL - SET LOGICAL DRIVE MAP
	AX = 440Fh
	BL = physical drive number (00h=default,01h=A:,etc))
Return: CF set on error
	    AX = error code (01h,0Fh) (see #0885 at AH=59h)
	CF clear if successful
	    drive now responds to next logical drive number
Notes:	maps logical drives to physical drives, similar to DOS's treatment of
	  a single physical floppy drive as both A: and B:
	DR-DOS 3.41-5.0 DRIVER.SYS does not support drive mapping and thus
	  always returns an error on this function
SeeAlso: AX=440Eh,INT 2F/AX=122Bh
--------D-214410-----------------------------
INT 21 - DOS 5+ - IOCTL - QUERY GENERIC IOCTL CAPABILITY (HANDLE)
	AX = 4410h
	BX = handle for device
	CH = category code (see #0765)
	CL = function code (see #0766)
Return: CF clear if successful
	    AX = 0000h	specified IOCTL function is supported
	CF set on error
	    AL = 01h	IOCTL capability not available
Note:	a program which wishes to use Generic IOCTL calls beyond those in the
	  standard DOS 3.2 set may use this call first to see whether a
	  particular call is supported
SeeAlso: AX=440Ch,AX=440Dh,AX=4411h
--------d-214410BXFFFF-----------------------
INT 21 U - NewSpace - ENABLE DRIVER
	AX = 4410h
	BX = FFFFh
Program: NewSpace is a TSR by Isogon Corporation which automatically compresses
	  all files as they are written and decompresses them as they are read
Note:	compressed files are not accessible unless the driver is enabled
SeeAlso: AX=4411h/BX=FFFFh
--------D-214411-----------------------------
INT 21 - DOS 5+ - IOCTL - QUERY GENERIC IOCTL CAPABILITY (DRIVE)
	AX = 4411h
	BL = drive number
	CH = category code (see #0778)
	CL = function code (see #0779)
Return: CF clear if successful
	    AX = 0000h	specified IOCTL function is supported
	CF set on error
	    AL = 01h	IOCTL capability not available
Note:	a program which wishes to use Generic IOCTL calls beyond those in the
	  standard DOS 3.2 set may use this call first to see whether a
	  particular call is supported
SeeAlso: AX=440Ch,AX=440Dh,AX=4410h
--------d-214411BXFFFF-----------------------
INT 21 U - NewSpace - DISABLE DRIVER
	AX = 4411h
	BX = FFFFh
Program: NewSpace is a TSR by Isogon Corporation which automatically compresses
	  all files as they are written and decompresses them as they are read
Note:	compressed files are not accessible unless the driver is enabled
SeeAlso: AX=4410h/BX=FFFFh
--------O-214412-----------------------------
INT 21 O - DR-DOS 5.0-6.0 - DETERMINE DOS TYPE
	AX = 4412h
	CF set
Return: CF set if not DR-DOS
	    AX = error code (see #0885 at AH=59h)
	CF clear if DR-DOS
	    DX = AX = version code (see #0794)
Note:	this obsolete call, which is no longer supported in Novell DOS 7, is
	  identical to AX=4452h
SeeAlso: AX=4452h
--------d-214412BXFFFF-----------------------
INT 21 U - NewSpace - INSTALLATION CHECK???
	AX = 4412h
	BX = FFFFh
Return: AX = PSP segment of NewRes (resident driver for NewSpace)
	BX:DX -> ???
	CX = ???
SeeAlso: AX=4411h/BX=FFFFh
--------d-214413BXFFFF-----------------------
INT 21 U - NewSpace - GET ???
	AX = 4413h
	BX = FFFFh
Return: AX = code segment of NewRes (resident driver for NewSpace)
	BX = offset of ???
SeeAlso: AX=4412h/BX=FFFFh
--------O-214414-----------------------------
INT 21 OU - DR-DOS 5.0-6.0 - SET GLOBAL PASSWORD
	AX = 4414h
	DS:DX -> password string (blank-padded to 8 characters)
Desc:	Specify the master password for accessing files.
Note:	this obsolete call, which is no longer supported in Novell DOS 7, is
	  identical to AX=4454h
SeeAlso: AX=4454h
--------d-214414BXFFFF-----------------------
INT 21 U - NewSpace - DEBUGGING DUMP
	AX = 4414h
	BX = FFFFh
Return: debugging dump written to X:\NEWSPACE.SMP
SeeAlso: AX=4413h/BX=FFFFh,AX=44FFh/BX=FFFFh
--------O-2144-------------------------------
INT 21 OU - DR-DOS 5.0-6.0 - HISTORY BUFFER, SHARE, AND HILOAD CONTROL
	AH = 44h
	AL = 16h to 18h
Note:	these obsolete subfunctions (which are no longer supported in Novell
	  DOS 7) are identical to AX=4456h through 4458h
SeeAlso: AX=4456h,AX=4457h,AX=4458h
--------O-214451-----------------------------
INT 21 - Concurrent DOS v3.2+ - INSTALLATION CHECK
	AX = 4451h
Return: CF set if not Concurrent DOS
	    AX = error code (see #0885 at AH=59h)
	CF clear if successful
	    AH = single-user/multiuser nature
		10h single-user
		    AL = operating system version ID (see #0794)
		14h multiuser
		    AL = operating system version ID (see #0793)
Notes:	as of Concurrent DOS/XM 5.0 (possibly earlier), the version is stored
	  in the environment variable VER
	use this function if you are looking for multiuser capabilities,
	  AX=4452h for single-user
	this function should never return the single-user values
SeeAlso: AX=4452h,AX=4459h

(Table 0793)
Values for Digital Research operating system version ID:
 32h	Concurrent PC DOS 3.2
 41h	Concurrent DOS 4.1
 50h	Concurrent DOS/XM 5.0 or Concurrent DOS/386 1.1
 60h	Concurrent DOS/XM 6.0 or Concurrent DOS/386 2.0
 62h	Concurrent DOS/XM 6.2 or Concurrent DOS/386 3.0
 66h	DR Multiuser DOS 5.1
 67h	Concurrent DOS 5.1
--------O-214452-----------------------------
INT 21 - DR-DOS 3.41+ - DETERMINE DOS TYPE/GET DR-DOS VERSION
	AX = 4452h ("DR")
	CF set
Return: CF set if not DR-DOS
	    AX = error code (see #0885 at AH=59h)
	CF clear if DR-DOS
	    AX = version code
	    AH = single-user/multiuser nature
		10h single-user
		    AL = operating system version ID (see #0794)
		14h multiuser
		    AL = operating system version ID (see #0793)
	    DX modified (see note)
Notes:	the DR-DOS version is stored in the environment variable VER
	use this function if looking for single-user capabilities, AX=4451h
	  if looking for multiuser; this call should never return multiuser
	  values
	in DR-DOS 3.41-6.0, DX=AX on return; for Novell DOS 7, DH=AH but DL=00h
	  (reportedly, DH=00h when booting NWDOS7 from installation disks)
	Novell DOS 7 returns error code 0001h if SETVER 255.x is in effect for
	  the calling program
SeeAlso: AX=4412h,AX=4451h,AX=4459h

(Table 0794)
Values for Digital Research operating system version ID:
 60h	DOS Plus
 63h	DR-DOS 3.41
 64h	DR-DOS 3.42
 65h	DR-DOS 5.00
 67h	DR-DOS 6.00
 70h	PalmDOS
 71h	DR-DOS 6.0 March 1993 "business update"
 72h	Novell DOS 7.0
--------O-214454-----------------------------
INT 21 U - DR-DOS 3.41+ - SET GLOBAL PASSWORD
	AX = 4454h
	DS:DX -> password string (blank-padded to 8 characters)
Desc:	Specify the master password for accessing files.
SeeAlso: AX=4303h,AX=4414h
--------O-214456-----------------------------
INT 21 U - DR-DOS 5.0+ - HISTORY BUFFER CONTROL
	AX = 4456h
	DL = control flags (see #0795)
Return: AL = previous value of state flags (see #0796)
Note:	DR-DOS 6.0 only checks bit 0 and ignores the rest of DL
SeeAlso: #0797

Bitfields for control flags:
Bit(s)	Description	(Table 0795)
 0	whose buffer: 0=application, 1=COMMAND.COM
---Novell DOS 7---
 1	toggle HISTORY usage
 2	toggle INSERT state 
Note:	only one bit at a time may be used

Bitfields for state flags:
Bit(s)	Description	(Table 0796)
 0	HISTORY buffer enabled
 1	INSERT enabled
 2-5	unused
 7	whose buffer: 0=application, 1=COMMAND.COM
--------O-214457-----------------------------
INT 21 U - DR-DOS 5.0+ - SHARE/HILOAD CONTROL
	AX = 4457h
	DH = subfunction
	    00h enable/disable SHARE
		DL = 00h disable
		   = 01h enable
		   else Return: AX = ???
	    01h get HILOAD status
		Return: AX = status
			    0000h off
			    0001h on
	    02h set HILOAD status
		DL = new state (00h off, 01h on)
		Return: AX = ???
	    other
		Return: AX = ???
Note:	This was seen called by COMMAND.COM of DR-DOS 6.0; it does not seem
	  to be supported by Novell DOS 7
SeeAlso: AX=4457h/DX=FFFFh
--------O-214457DXFFFF-----------------------
INT 21 U - DR-DOS 6.0 - GET SHARE STATUS
	AX = 4457h
	DX = FFFFh
Return: AX = SHARE status
SeeAlso: INT 2F/AX=1000h
--------O-214458-----------------------------
INT 21 U - DR-DOS 5.0+ internal - GET POINTER TO INTERNAL VARIABLE TABLE
	AX = 4458h
Return: ES:BX -> internal variable table (see #0797,#0798)
	AX = ??? (0B50h for DR-DOS 5.0, 0A56h for DR-DOS 6.0, 0FE4h for
		  Novell DOS 7)
SeeAlso: AX=4452h

Format of DR-DOS 5.0-6.0 internal variable table:
Offset	Size	Description	(Table 0797)
 00h	WORD	???
 02h	WORD	segment of ???
 04h	WORD	offset within DOS data segment of history control structure
		  for COMMAND.COM history buffer (see #0799)
 06h	WORD	offset within DOS data segment of history control structure
		  for application history buffer (see #0799)
 08h	BYTE	initial history state flags (see #0796)
 09h  2 BYTEs	???
 0Bh	WORD	KB of extended memory at startup
 0Dh	BYTE	number of far jump entry points
 0Eh	WORD	segment containing far jumps to DR-DOS entry points (see #0800)
 10h	WORD	(only if kernel loaded in HMA) offset in HMA of first free HMA
		  memory block (see #0801) or 0000h if none; segment is FFFFh
 12h	WORD	pointer to segment of environment variables set in CONFIG,
		  or 0000h if already used
---DR-DOS 6.0---
 14h	WORD	(only if kernel loaded in HMA) offset in HMA of first used HMA
		memory block (see #0801) or 0000h if none; segment is FFFFh
 16h  8 BYTEs	???
 1Eh	WORD	offset in DOS data segment of full COUNTRY.SYS filename
 20h  8 BYTEs	???
 28h	WORD	offset in DOS data segment of SHARE hook table
 2Ah  2 BYTEs	???
 2Ch	WORD	offset in DOS data segment of far pointer to INT 2F/AX=1000h
		  handler
Note:	the segment used for the DR-DOS 6.0 CONFIG environment variables
	  (excluding COMSPEC, VER and OS) is only useful for programs/drivers
	  called from CONFIG.SYS. The word is set to zero later when the area
	  is copied to the COMMAND.COM environment space.  This allows
	  CONFIG.SYS to pass information to AUTOEXEC.BAT.

Format of Novell DOS 7 internal variable table:
Offset	Size	Description	(Table 0798)
 00h	???
 1Eh	WORD	offset of COUNTRY.SYS filename
 42h 16 DWORDs	pointers to ??? entry points
	???

Format of history control structure:
Offset	Size	Description	(Table 0799)
 00h	WORD	segment of buffer
 02h	WORD	size of buffer in bytes
 04h	WORD	???

Format of kernel entry jump table for DR-DOS 5.0-6.0:
Offset	Size	Description	(Table 0800)
 00h  5 BYTEs	far jump to kernel entry point for CP/M CALL 5
 05h  5 BYTEs	far jump to kernel entry point for INT 20
 0Ah  5 BYTEs	far jump to kernel entry point for INT 21
 0Fh  5 BYTEs	far jump to kernel entry point for INT 22 (RETF)
 14h  5 BYTEs	far jump to kernel entry point for INT 23 (RETF)
 19h  5 BYTEs	far jump to kernel entry point for INT 24
 1Eh  5 BYTEs	far jump to kernel entry point for INT 25
 23h  5 BYTEs	far jump to kernel entry point for INT 26
 28h  5 BYTEs	far jump to kernel entry point for INT 27
 2Dh  5 BYTEs	far jump to kernel entry point for INT 28
 32h  5 BYTEs	far jump to kernel entry point for INT 2A (IRET)
 37h  5 BYTEs	far jump to kernel entry point for INT 2B (IRET)
 3Ch  5 BYTEs	far jump to kernel entry point for INT 2C (IRET)
 41h  5 BYTEs	far jump to kernel entry point for INT 2D (IRET)
 46h  5 BYTEs	far jump to kernel entry point for INT 2E (IRET)
 4Bh  5 BYTEs	far jump to kernel entry point for INT 2F
Notes:	all of these entry points are indirected through this jump table
	  to allow the kernel to be relocated into high memory while leaving
	  the actual entry addresses in low memory for maximum compatibility
	some of these entry points (22h,23h,24h,2Eh,2Fh) are replaced as soon
	  as COMMAND.COM is loaded, and return immediately to the caller, some
	  returning an error code (the original handler for INT 2F returns
	  AL=03h [fail]).

Format of HMA Memory Block (DR-DOS 6.0 kernel loaded in HMA):
Offset	Size	Description	(Table 0801)
 00h	WORD	offset of next HMA Memory Block (0000h if last block)
 02h	WORD	size of this block in bytes (at least 10h)
 04h	BYTE	type of HMA Memory Block (interpreted by MEM)
		00h system
		01h KEYB
		02h NLSFUNC
		03h SHARE
		04h TaskMAX
		05h COMMAND
 05h	var	TSR (or system) code and data. DR-DOS TSR's, such as KEYB,
		  hooks interrupts using segment FFFEh instead FFFFh.
--------O-214459-----------------------------
INT 21 - DR MultiUser DOS 5.0 - API
	AX = 4459h
	CL = function (see #2602 at INT E0"CP/M")
	DS,DX = parameters
Notes:	DR-DOS 5.0 and Novell DOS 7 return CF set and AX=0001h
	this API is also available on INT E0
SeeAlso: AX=4452h,INT E0"CP/M"
--------N-2144E0-----------------------------
INT 21 U - Sun PC-NFS - API???
	AX = 44E0h
	DS:DX -> ???
	SS:BP -> stack frame (see #0802)
Return: ???
Note:	this function is also supported by Beame&Whiteside's BWPCNFS shim; the
	  description presented here was derived from that shim

Format of PC-NFS stack frame:
Offset	Size	Description	(Table 0802)
 00h	WORD	-> previous stack frame
 02h	DWORD	return address
--------d-2144FFBXFFFF-----------------------
INT 21 U - NewSpace - ???
	AX = 44FFh
	BX = FFFFh
	DX = ???
Program: NewSpace is a TSR by Isogon Corporation which automatically compresses
	  all files as they are written and decompresses them as they are read
SeeAlso: AX=4414h/BX=FFFFh
--------!---Section--------------------------
