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
OF1
Reset math coprocessor
OF8 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