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Sunday, 20 October 2019
 
 
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Standard DMA, I/O and IRQ Assignments

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Standard DMA Assignments
DMAFunctionBus slot required
0UnusedYes (16-bit)
1UnusedYes (8-bit)
2Floppy disk controller boardYes (8-bit)
3UnusedYes (8-bit)
4First DMA controller ICNo (motherboard)
5UnusedYes (16-bit)
6UnusedYes (16-bit)
7UnusedYes (16-bit)

Standard I/O Assignments
AddressAssignment
000h-00Fh8237A-5 DMA Controller IC #1
020h-03Fh8269A Programmable Interrupt Controller IC #1
040h-05Fh8254-2 System Timer IC
060h8042 Keyboard/Mouse Controller IC
061hSystem board I/0 port
064h8042 Keyboard/Mouse Controller IC
070h-07FhRTC port and NMI mask port
080hPOST code port
080h-09Fh74LS612 DMA Page Registers
0A0h-0BFh8237A-5 Programmable Interrupt Controller IC #2
0F0hClear math coprocessor busy
0F1hReset math coprocessor
0F8h-0FFhMath coprocessor ports
1F0h-1F8hHard disk controller ports (Primary IDE)
170h-178hHard disk controller ports (Secondary IDE)
200h-20FhGame control ports
238h-23BhBus mouse adapter ports
23Ch-23FhAlternative bus mouse adapter ports
278h-27FhParallel printer 2 (LPT2)
2B0h-2DFhAlternative EGA ports
2E0h-2E7hGPIB (Adapter 0)
2E8h-2EFhSerial port 4 (COM4)
2F8h-2FFhSerial port 2 (COM2)
300h-31FhUnassigned
360h-363hNetwork card ports (low)
368h-36BhNetwork card ports (high)
378h-37FhParallel printer 1 (LPT1)
380h-38FhSDLC (bisyne 2) ports
3A0h-3AFhBisyne 1 ports
3B0h-3BBhMonochrome display adapter (MDA) ports
3BCh-3BFhParallel printer 3 (LPT3)
3C0h-3CFhEnhanced graphics adapter (EGA) ports
3D0h-3DFhColor graphics adapter (CGA) ports
3E8h-3EFhSerial port 3 (COM3)
3F0h-3F7hFloppy disk controller ports
3F8h-3FFhSerial port 1 (COM1)

Standard IRQ Assignments
IRQFunctionBus slot required
0System timer ICNo (motherboard)
1Keyboard controller ICNo (motherboard)
2Second IRQ controller ICNo (motherboard)
3Serial port 2 (COM2)*Yes (8-bit)
4Serial port 1 (COM1)*Yes (8-bit)
5Parallel port 2 (LPT2)*Yes (8-bit)
6Floppy disk controller board*Yes (8-bit)
7Parallel port 1 (LPT1)*Yes (8-bit)
8Real-time clock (RTC)No (motherboard)
9Unused (redirected to IRQ 2)Yes (8-bit)
10UnusedYes (16-bit)
11UnusedYes (16-bit)
12Motherboard mouse port (PS2)*Yes (16-bit)
13Math coprocessorNo (motherboard)
14Primary IDE Hard disk controller board*Yes (16-bit)
15Secondary IDE Hard disk controller board*Yes (16-bit)

* Please note that most of these devices are now integrated into the motherboard and no longer require slots.

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