

     20.  CHANGES

     Be sure to save your serial number/password (SNP) card and the putsnp
     program you received from Omen Technology to use with future versions of
     DSZ you may download!  (Use GCOLORS to serialize GSZ.)

     Current GSZ and DSZ versions are maintained on EXEC-PC BBS, BIX, GEnie
     (IBM Roundtable), CompuServe (IBMCOM and CONSULT SIGs) as well as Omen's
     TeleGodzilla (503-621-3746).

     DSZ is a popular program which has been the object of virus attacks.
     Pirated/hacked versions of DSZ have cost users and DSZ's developer
     thousands of dollars in lost time and other expenses, in addition to
     injuring of Omen Technology's reputation.

     Virus and Trojan code hidden in hacked/pirated copies of DSZ and
     programs claiming to "register DSZ" have caused loss of data.

     -rw-r--r--   1 caf      omen       53568 Feb 02 17:13 dsz.com
     -rwxrwxr-x   1 caf      omen       60933 Feb 02 17:11 dsz.exe
     PKZIP -vt 32 bit CRC: C40843E8   53568  dsz.com
     PKZIP -vt 32 bit CRC: 92927A38   60933  dsz.exe

     -rw-r--r--   1 caf      omen       32864 Feb 03 02:36 gcolors.exe
     -rw-r--r--   1 caf      omen       71712 Feb 03 02:36 gsz.exe
     PKZIP -vt 32 bit CRC: A6FF619E   71712  gsz.exe
     PKZIP -vt 32 bit CRC: E83AEFB2   32864  gcolors.exe

     Your copy of DSZ should show the same CRC values.  ZIP uses a 32 bit CRC
     compatible with the Professional-YAM and ZCOMM "crc" command.
           pkzip -vt dsz
     The following Pro-YAM/ZCOMM command gives the 32 bit CRC for DSZ.COM:

     EXAMPLE: >>>c: crc dsz.com

     If your copy shows a different CRC or file length, insist on a
     legitimate copy and report the source of the bogus/pirated copy to Omen
     Technology Inc.  Omen Technology has received reports of serious
     problems caused by unauthorized patches to DSZ, and cannot assume
     liability for the performance of the resultant code.


     COM7 and COM8 are changed; see the "port" command above.

     A problem in the 1/17/89 and 2/2/89 DSZ versions corrupts files under
     unusual circumstances.  Please delete all instances of the 1/17/89 and
     2-02-89 version.

     There never was a "zmodem d" parameter in DSZ.  Older versions of DSZ
     ignored attempts to set this nonexistent parameter with a message that
     humans ignored.  DSZ now aborts when asked to set a nonexistent





     Chapter 20 Pg 60      DSZ Reference Rev Feb-02-94         Typeset 2-3-94


     parameter.  There is a "d" parameter that controls time/date stamping of
     files; Bulletin boards that need to disable time/date stamping of
     received files should simply use "pd0" not preceded by a "z".

     Good news for tired frog stompers!  The ZMODEM rz/sz programs are
     available in native VMS flavors with wild cards, record format support,
     etc..  Pre compiled VAX/VMS files are contained in the RZSZ.TLB
     compressed text library, available in the TeleGodzilla (503-621-3746)
     upgrade/vms subdirectory, Compuserve VAXFORUM, GEnie, and other bulletin
     boards.

     The DSZ and GSZ "t" command uses the DOS console driver for terminal
     emulation.  Standard ANSI.SYS is limited to a small subset of ANSI
     escape sequences; NANSI.SYS, FANSI-Console and other replacement console
     drivers provide faster screen updates and better ANSI terminal
     emulation.

     DESQview users: make sure "Separate Shift State" is set to "N".  (Tnx to
     Tim Trott for this info.)

     Feb 02 1994: Fixed anomalies with YMODEM-g and time display.  Hardware
     support was revised to accomodate a Hayes ESP board incompatibility with
     the 16550 spec.

     Jan 27 1994:  Added the "G" command to send an XON character to the
     modem.  This is useful when calling dsz from MSKermit as MSKermit sends
     an XOFF character to the modem.  Multitasking on OS/2 and Windows has
     been improved.  Handshake slow is more aggressive in flushing disk
     buffers.

     Nov 29 1993:  Rebuilt to correct zipfile authentication problems.
     Detection of 7-bit and nontransparent paths improved.

     Nov 27 1993:  Serial I/O has been tuned for more efficient operation
     with internal modems using firmware driven virtual UARTs.

     May 29 1993: The portx command now works with IRQ's up to 15, and,
     optionally, nonstandard baudrate clocks.
     EXAMPLE: dsz portx 3e8,15 rz -m

     Newer UART chips can use raw bit rate sources higher than the standard
     1.8432 MHz.  Some 386 and 486 machines support MobyBaud(TM) operation
     above 115200 bps.

     To support a nonstandard bit rate source, multiply 5760 by the new raw
     bit rate source frequency in MHz divided by 1.84320.
     EXAMPLE: dsz portx 3e8,15,57600   sp 38400 rz -m
     supports the 18.432 MHz clock option on the Boffin Electronics "WinSport
     II" 2 port serial board.
