HP Vectra XA 5/xxx HP Vectra xA 5/XXX Series 5 /vl 5/xxx series 5 pc Technical - Page 79

BIOS Addresses

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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. 0 - 3FFh 400h - 4FFh 500h - 9EFFFh 9F000h - 9FFFFh A0000h - BFFFFh C0000h - C7FFFh C8000h - D7FFFh D8000h - EFFFFh F0000h - FFFFFh 100000h - FFFFFFFFh Interrupt vector table BIOS data area 640 KB: The addresses 0-9FFFFh are collectively known as the Base memory 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 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). 79

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79
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, are no longer
accessed directly. Instead, the information is obtained from utilities in the
Desk Management Interface (DMI).
0 - 3FFh
Interrupt vector table
640 KB: The addresses
0-9FFFFh are collectively
known as the Base
memory area
400h - 4FFh
BIOS data area
500h - 9EFFFh
9F000h - 9FFFFh
Extended BIOS data area
A0000h - BFFFFh
128 KB: Video memory area
C0000h - C7FFFh
32 KB: Video BIOS area
C8000h - D7FFFh
64 KB: available for accessory boards
(used by the boot ROM, if configured in the
Setup
program)
D8000h - EFFFFh
96 KB: available after the POST (for upper memory block, UMB, for example)
F0000h - FFFFFh
64 KB: System BIOS area
100000h - FFFFFFFFh
1 MB plus: Extended memory