Bios Addresses; System Memory Map; Hp I/O Port Map (I/O Addresses Used By The System) - HP Vectra VL420 Technical Reference Manual

BIOS Overview

BIOS Addresses

This section provides a summary of the main features of the HP system BIOS.

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 - 000E 0000
000E 0000 - 000F FFFF
10 0000 - FF FFFF
100 0000 - 1FF FFFF
200 0000 -3FF FFFF
400 0000 -1FFF FFFF
FFF80000 - FFFF FFFF
1.The last MB of memory in this area is used as Unified Memory Architecture (UMA) embedded memory.

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 64KB 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).
Although the Setup program can be used to change some of the settings, the following address map is
not completely BIOS dependent, but is determined partly by the operating system. Note that some of the
I/O addresses are allocated dynamically.
42 product description
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
System BIOS (Flash/Shadow)
Memory (1MB to 16MB)
Memory (16MB to 32MB)
Memory (32MB to 64MB)
1
Memory (64MB to 512MB)
512KB BIOS (Flash)