I/O Address Map - DEC Digital PC 3500 System Reference Manual

I/O Address Map

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