Device Mapping
Digital VENTURIS Pentium PC
72
MCS Logistics Engineering - Nijmegen
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 coprocessor busy
0F1
Reset math coprocessor
0F8 - 0FF
Math coprocessor
170 - 177
Secondary IDE controller
1F0 - 1F7
Primary IDE controller
278 - 27A
LPT2
2E8 - 2EF
COM4
2F8 - 2FF
COM2
376 - 377
Secondary IDE controller (alt status, device address)
378 - 37A
LPT1
3B0 - 3DF
VGA register
3BC - 3BE
LPT3
3E8 - 3EF
COM3
3F0 - 3F7
Diskette controller
3F6 - 3F7
Primary IDE controller (alt status, device address)
3F8 - 3FF
COM1
46E8
VGA enable register
42E8, 4AE8, 82E8, 86E8,
8AE8, 8EE8, 92E8, 96E8,
9AE8, 9EE8, A2E8, A6E8,
AAE8, AEE8, B2E8, B6E8,
BAE8, BEE8, E2E8, E2EA
VGA enhanced mode registers