HP Vectra XU5 Reference Manual page 52

HP BIOS I/O Port Map
This section describes the HP BIOS I/O port map. "Addressing System Board Components"
provides more details on how the BIOS uses the system board components mentioned in
the I/O port list.
Within the port map:
Reserved I/O addresses are reserved for HP private use. To avoid compatibility issues,
do not use these addresses.
Undefined I/O addresses can be used, but compatibility issues may still occur.
Hex addresses from 0 to FF are 8-bit ports.
Hex addresses from 100 to FFFF are either 8, 16, or 32-bit ports.
8237-CP = DMA controller (8237-compatible).
Ch. = Channel(s).
Int. Cont. = Interrupt Controller (8259-compatible).
PI Timer = Programmable Interval Timer (8254-compatible).
HP Vectra I/O Port Map
I/O Address Ports
0000–000F
0020–0021
0040–0043
0060,0064
0061
0070
0071
0080–008F
0092
0896–089B
088C–089F
00A0–00A1
00C0–00DF
00F0
0170–0177
01F0–01F7
0278–027F
02E8–02EF
02F8–02FF
0370–0377
0378–037F
03B0– 03DF
Vectra XU Technical Reference
Function
DMA Controller 1
Interrupt Controller 1
Interval Timer 1
Keyboard Controller
NMI Status and Control
NMI mask reg., RTC address
RTC data
DMA Low Page Register
Alternate reset and A20 function
Internal ports
Hardware counter
Interrupt Controller 2
DMA Controller 2
Co-processor error
Secondary IDE Controller
IDE Controller
Parallel Port 3
Serial Port 4
Serial Port 2
Secondary Floppy Controller
Parallel Port 2
S3 PCI Video
Summary of the HP BIOS
Bits
8
8
8
8
8
8
8
8
8
8
8
x
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