Physical and Operating Specifications
7-5
Compaq Confidential – Need to Know Required
Writer: Bruce Sullivan Project: Compaq Deskpro Workstation AP250 Maintenance and Service Guide Comments:
Part Number: 118133-001 File Name: h-ch7 Physical and Operating Specifications.doc Last Saved On: 10/4/99 4:34 PM
Table 7-4
System I/O
continued
I/O Address (Hex)
System Function (Shipping Configuration)
072-077
CMOS storage
072 - 07F
Unused
080 - 08F
DMA page registers
090 - 091
Unused
092
Port A
093 - 09F
Unused
0A0 - 0BF
Interrupt controller #2
0C0 - 0DF
DMA controller #2
0E0 - 0EB
Unused
0EC - 0ED
483 configuration index/data
0EE - 0EF
483 fast A20/fast reset
0F0 - 0F1
Co-processor busy clear/reset
0F2 - 0F3
Unused
0F4 - 0F5
483 CPU speed slow/fast
0F6 - 0F8
Unused
0F9
483/PGL configuration lock
0FA
Unused
0FB
483/PGL configuration unlock
0FC - 0FF
Unused
100 - 12F
Unused
130 - 131
Modem PGL index/data (default; alternate = 140h, 260h, 270h)
132 - 16F
Unused
170 - 177
Reserved; IDE controller can be set in Setup.
15C - 15D
Super I/O index/data register
178 - 1EF
Unused
1F0 - 1F7
Fixed disk controller
continued