![HP Vectra VE5 3 Technical Reference Manual Download Page 51](http://html.mh-extra.com/html/hp/vectra-ve5-3/vectra-ve5-3_technical-reference-manual_2172174051.webp)
43
4 Summary of the HP/Phoenix BIOS
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.
Product Identification
The reserved addresses in the 64 KB BIOS ROM data area, which contain
various product identification and BIOS identification strings have no fixed
addresses, and are no longer accessed directly. Instead, the information is
obtained from utilities in the Desk Management Interface (DMI).
HP I/O Port Map (I/O Addresses Used by the System
1
)
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.
1.
If configured.
00000h - 9FFFFh
640 KB
–
Base Memory Area
A0000h - BFFFFh
128 KB
–
Video Memory
C0000h - C7FFFh
32 KB
–
Video BIOS
C8000h - DFFFFh
96 KB
–
Accessory Boards Memory
E0000h - EFFFFh
64 KB
–
Available
F0000h - FFFFFh
64 KB
–
System BIOS
100000h - FFFFFFFFh
1 MB plus
–
Extended Memory