Technical data

Device Mapping
B-3
I/O Address Map
Range (hexadecimal) Function
000 - 00F DMA controller one
020 - 021 Interrupt controller one
040 - 043 Interval timer
060 - 06F Keyboard controller
070 - 07F Real-Time Clock (RTC), NMI
080 - 08F DMA page register
0A0 - 0A1 Interrupt controller two
0C0 - 0CF DMA controller two
0F0 Clear math co-processor busy
0F1 Reset math co-processor
0F8 - 0FF Math co-processor
170 - 177 Secondary IDE controller
1F0 - 1F7 Primary IDE controller
220 - 22F Audio (if enabled)
278 - 27A LPT2
2E8 - 2EF COM4
continued