Hp I/O Port Map (I/O Addresses Used By The System) - HP Vectra XW Technical Reference Manual

4 HP BIOS
BIOS Addresses
HP I/O Port Map (I/O Addresses Used by the System
Peripheral devices, accessory devices and system controllers are accessed
via the system I/O space, which is not located in system memory space. The
64 KB of addressable I/O space comprises 8-bit and 16-bit registers (called
I/O ports) located in the various system components. When installing an
accessory board, ensure that the I/O address space selected is in the free
area of the space reserved for accessory boards (100h to 3FFh).
This is not BIOS dependent. It applies to the operating system, too.
However, the Setup program can be used to change some settings.
I/O Address Ports
0000h - 000Fh
0020h - 0021h
0040h - 0043h
0060h, 0064h
0061h
0070h
0071h
0081h - 0083h, 008Fh
0092h
0096h - 009Fh
00A0h - 00A1h
00C0h - 00DFh
00EAh - 00EBh
00F0h - 00FFh
0102h
0170h - 0177h
01F0h - 01F7h
1. If configured.
38
Function
DMA controller 1
Interrupt controller 1
Interval timer 1
Keyboard controller
System speaker, or NMI status and control
NMI mask register, RTC and CMOS address
RTC and CMOS data
DMA low page register
Alternate reset and A20 Function
Internal ports (Little Ben)
Interrupt controller 2
DMA controller 2
Internal port
Co-processor error
Graphics controller (AccelGraphics)
IDE hard disk drive controller secondary channel
IDE hard disk drive controller primary channel
1
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