Bios Addresses; System Memory Map; Product Identification - HP Vectra VL5 5 Technical Reference Manual

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.
0 - 3FFh
400h - 4FFh
500h - 9EFFFh
9F000h - 9FFFFh
A0000h - BFFFFh
C0000h - C7FFFh
C8000h - D7FFFh
D8000h - EFFFFh
F0000h - FFFFFh
100000h - FFFFFFFFh

Product Identification

The reserved addresses in the 64 KB BIOS ROM data area, which contain
various product identification and BIOS identification strings, are no longer
accessed directly. Instead, the information is obtained from utilities in the
Desk Management Interface (DMI).
Interrupt vector table
BIOS data area
Extended BIOS data area
128 KB: Video memory area
32 KB: Video BIOS area
64 KB: available for accessory boards
(used by the boot ROM, if configured in the Setup program)
96 KB: available after the POST (for upper memory block, UMB, for example)
64 KB: System BIOS area
1 MB plus: Extended memory
4 Summary of the HP/Phoenix BIOS
BIOS Addresses
640 KB: The addresses
0-9FFFFh are collectively
known as the Base
memory area
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