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4 HP 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.
The procedure for updating the System ROM firmware is described on page
50.
System Memory Map
Reserved memory used by accessory boards must be located in the area
from C8000h to EFFFFh.
1.
This is for Physical memory. As soon as the PST has
been completed, the E000-EFFF area has to be re-
leased for UMBs.
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 - 000F FFFF Adapter ROM, RAM, memory-mapped registers
000E 0000 - 000F FFFF 128 KB BIOS (Flash/Shadow)
1
10 0000 - FF FFFF Memory (1 MB to 16 MB)
100 0000 - 1FF FFFF Memory (16 MB to 32 MB)
200 0000 -3FF FFFF Memory (32 MB to 64 MB)
400 0000 -1FFF FFFF Memory (64 MB to 512 MB)
FFFE 0000 - FFFF FFFF 128 KB BIOS (Flash)