3 BIOS Overview
BIOS Addresses
36
BIOS Addresses
This section provides a summary of the main features of the PC’s
system BIOS.
System Memory Map
Reserved memory used by accessory boards must be located in the
area from C8000h to EFFFFh.
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
System BIOS (Flash/Shadow)
1
1.
This is for Physical memory. As soon as the POST has been completed, the
E0000-E8000 segment is released for UMBs.
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)
FFFC0000 - FFFF FFFF
256 KB BIOS (Flash)
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