System I/O Address Map
Hex address Assigned device
000.01F DMA controller 1, 8237
020-03F Interrupt controller 1, 8259
022-024 Reserved
040-05F Timer, 8254
060-06F Keyboard controller, 8242PE
070-07F Real-time clock NMI (non-maskable interrupt)
080-09F DMA page register, 74LS612
0A0-0BF Interrupt controller 2, 8259
0C0-0DF DMA controller 2, 8237
0F0 Clear math coprocessor
0F1 Reset math coprocessor
0F8-OFF Math coprocessor
1F0-1F8 Primary hard disk interface
1E0-1E7 Secondary hard disk interface
200-207 Game I/O
278-27F Parallel printer port 2
2B0-2DF Alternate enhanced graphics adapter
2E1 GPIB (adapter 0)
2E2, 2E3 Data acquisition (adapter 0)
2F8 2FF Serial port 2
300-31F Prototype card
360-363 Available
368-36B Available
378-37F Parallel printer port 1
380-38F Available
390-393 Available
3A0-3AF Available
3B0-3BF Available
3C0-3CF Available
3D0-3DF Available
3F0-3F7 Diskette drive controller
3F8-3FF Serial port 1
Specifications A-13
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