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Document ID: RMIE-3FZBSN |
Aptiva - 2136 Addresses, IRQs and Channel Assignments
Applicable to: World-Wide
System Input/Output Addresses
This table shows the hexadecimal addresses for each of the system board input/output (I/O) functions.
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Table 1- 4 System Input / Output Addresses Table |
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Address range - Function |
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0000-001F - DMA controller 1 |
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0020-003F - Interrupt controller 1 |
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0040-0047 - System timer |
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0050-0057 - System timer |
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0060-006F - System controller 8742 |
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0070CMOS - RAM address and NMI mask |
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0078-007B - Real-time clock |
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0080-009F - DMA page register |
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00A0-00BF - Interrupt controller 2 |
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00C0-00D - FDMA controller 2 |
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000F-00FF - Math coprocessor |
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0170-0177, 0376 - Secondary IDEhard diskI/O address controller |
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01F0-01F7, 03F6 - Primary IDE controller |
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0200-0207 - Joystick |
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0220-022F, |
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0330-0333 - MIDI |
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0278-027F - Parallel port 2 |
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02F8-022F - Serial port 2 |
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0378-037F - Parallel port 1 |
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03F0-03F7 - Diskette I/O address drive controller |
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03F8-03FF - Serial port 1/modem |
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0CF8PCI - mechanism #1 configuration address register |
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0CFCPCI - mechanism #2 configuration data register |
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F000-F010 - Bus master IDE |
System Interrupts
This table shows the system interrupt requests (IRQs) and their functions. You may use this information if you install an adapter card that requires you to set IRQs.
Note: IRQ 11 may be used if hardware MPEG is enabled.
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Table 1- 5 System Interrupts Table |
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Interrupt request (IRQ)Function |
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0Timer |
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1Keyboard |
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2Cascade interrupt control |
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3Serial alternate/modem |
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4Serial primary |
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5Audio |
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6DiskettedisketteIRQ assigment |
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7Parallel port |
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8Real-time clock |
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9MIDI |
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10Not used |
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11Not used |
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12PS/2 mouse |
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13Math coprocessor |
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14Primary IDEhard diskIRQ assigment |
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15Secondary IDE |
DMA memory map Channel Assignments
This table shows the channel assignments for direct memory access (DMA). DMA allows I/O devices to transfer data directly to and from memory. You may need to select an open DMA channel if you add an I/O device that uses DMA.
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Table 1- 6 DMA Channel Assignments Table |
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DMA channel - Assignment |
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0 - Audio |
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1 - Audio |
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2 - Diskette DMA channel |
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3 - Audio |
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4 - Cascade |
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5 - Not used |
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6 - Not used |
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7 - Not used |
Serial Port Addresses
The built-in serial port supports these addresses and interrupts.
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Table 1- 7 Serial Port Addresses Table |
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Address - Windows 95 Interrupt - Default |
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3F8 - COM1 IRQ 4 - Modem |
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3E8 - COM3 - Serial port B |
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2F8 - COM2 IRQ 3 - Serial port A |
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2E8 - COM4 |
Note: Conflicts may arise if you add adapter cards with serial ports or if you change the address settings on your modem if you are using an operating system other than Windows 95. You can resolve most of these conflicts by using the BIOS Setup Utility to change serial port addresses.
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Search Keywords |
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Hint Category |
Hardware Installation/Configuration | |
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Date Created |
10-04-97 | |
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Last Updated |
14-12-98 | |
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Revision Date |
14-12-99 | |
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Brand |
IBM Aptiva | |
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Product Family |
Aptiva | |
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Machine Type |
2136 | |
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Model |
all | |
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TypeModel |
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Retain Tip (if applicable) |
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Reverse Doclinks |