7-5
Compaq Professional Workstation AP400 Maintenance and Service Guide
System I/O
Continued
I/O Address (Hex)
System Function (Shipping Configuration)
080 - 08F
DMA Page Registers
090 - 091
Motherboard
092
Port A
093 - 09F
Motherboard
0A0 - 0BF
Interrupt Controller # 2
0C0 - 0DF
DMA Controller # 2
0E0 - 0EB
Unused
0EC - 0ED
Unused
0EE - 0EF
Unused
0F0 - 0FF
Co-Processor Busy Clear/Reset
100 - 15B
Unused
15C - 15D
Super I/O Index Register
15F - 16F
Unused
170 - 177
Reserved; IDE Controller can be set here in Setup.
178 - 1EF
Unused
1F0 - 1F7
Fixed Disk Controller
1F8 - 1FF
Unused
200
Unused
201
PremierSound Audio
202 - 21F
Unused
220 - 22F
Business Audio (Default; Alter =230h, 240h, 250h)
230 - 27B
Unused
274 - 277
ISA PNP
278 - 27F
Reserved Parallel Port
280 - 2E7
Unused
2E8 - 2EF
Reserved Serial Port
2F0 - 2F7
Unused
2F8 - 2FF
Modem (COM 2)
300 - 32F
Unused
Continued