Bios Addresses; System Memory Map; Hp I/O Port Map (I/O Addresses Used By The System) - HP Vectra VLi8 Technical Reference Manual

4 BIOS Overview

BIOS Addresses

BIOS Addresses
This section provides a summary of the main features of the HP system BIOS.
This is software that provides an interface between the computer hardware
and the operating system.

System Memory Map

Reserved memory used by accessory boards must be located in the area from
C8000h to EFFFFh.
0000 0000 - 0000 03FF
0000 0400 - 0000 04FF
0000 0500 - 0009 FC00
0009 FC00 - 0009 FFFF
000A_0000 - 000B_FFFF
000C 0000 - 000C 7FFF
000C 8000 - 000F FFFF
000E 0000 - 000F FFFF
10 0000 - FF FFFF
100 0000 - 1FF FFFF
200 0000 -3FF FFFF
400 0000 -1FFF FFFF
FFFC0000 - FFFF FFFF
1.
This is for Physical memory. As soon as the PST has been
completed, the E0000-E8000 segment is released for UMBs.
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).
1. If configured.
50
Real-mode IDT
BIOS Data Area
Used by OS
Extended BIOS Data Area
Video RAM or
SMRAM (not visible unless in SMM)
Video ROM
Adapter ROM, RAM, memory-mapped registers
1
System BIOS (Flash/Shadow)
Memory (1 MB to 16 MB)
Memory (16 MB to 32 MB)
Memory (32 MB to 64 MB)
Memory (64 MB to 512 MB)
256 KB BIOS (Flash)
1
)