System l/O Address Map
Hex address Assigned device
000.OlF 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
OAO OBF Interrupt controller 2, 8259
OCO-ODF DMA controller 2, 8237
OF0
Clear math coprocessor
OF1
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
280-2DF 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
380-3BF Available
3C0-3CF Available
3D0-3DF Available
3F0-3F7 Diskette drive controller
3F8-3FF Serial port 1
Specifications A-13
