Compaq D310 Bios Addresses, System Memory Map, HP I/O Port Map I/O Addresses Used by the System

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	Real-mode IDT
0000	0400		- 0000 04FF	BIOS Data Area
0000	0500		- 0009 FC00	Used by OS
0009	FC00 - 0009 FFFF			Extended BIOS Data Area
000A_0000 - 000B_FFFF				Video RAM or SMRAM (not visible unless in SMM)
000C	0000		- 000C 7FFF	Video ROM
000C	8000		- 000E 0000	Adapter ROM, RAM, memory-mapped registers
000E 0000			- 000F FFFF	System BIOS (Flash/Shadow)
10 0000 - FF FFFF				Memory (1MB to 16MB)
100 0000		- 1FF FFFF		Memory (16MB to 32MB)
200 0000		-3FF FFFF		Memory (32MB to 64MB)
400 0000		-1FFF FFFF		Memory (64MB to 512MB)1
FFF80000 - FFFF FFFF				512KB BIOS (Flash)

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.

44 Evo D310 Micro Desktop