Bios Addresses; System Memory Map - HP Vectra XW 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.
The procedure for updating the System ROM firmware is described on page
18.
There is BIOS support for ISA "Plug and Play" accessory board
configuration. It includes support for Plug and Play 1.0A, IDE PIO mode 4,
Startup center, flash memory, desktop management interface (DMI) and the
data integrity features. It ensures PCI 2.0 compliance with PCI-to-PCI bridge
support. The SCSI BIOS is also integrated with the system BIOS.

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 - D3FFFh
D4000h - DFFFFh
E0000h - EFFFFh
F0000h - FFFFFh
100000h - FFFFFFFFh
Interrupt vector table
BIOS data area
Extended BIOS data area
128 KB: Video memory area
32 KB: Video BIOS area
48 KB: SCSI area
48 KB: available for accessory boards
64 KB: available (used by the Boot ROM, if configured in the Setup program)
64 KB: System BIOS area
1 MB plus: Extended memory
4 HP BIOS
BIOS Addresses
640 KB: Base memory
area
35