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3-32 Chapter 3: Setup
Memory Map
The following table details the memory map for the Pentium III/Celeron
processors. The ESCD area from ED000-EDFFF is not available for use as
an Upper Memory Block (UMB) by memory managers. The area from
E0000-EBFFF is currently not used by the BIOS and is available for use as
UMB by memory managers. Parts of this area may be used by future
versions of the BIOS to add increased functionality.
Address Range (hex)
FECFF000-FECFF01B 27
100000-10000000
F0000-FFFFF
EE000-EFFFF
ED000-EDFFF
EC000-ECFFF
E0000-EBFFF
D0000-DFFFF
CE000-CFFFF
CC000-CDFFF
C8000-CBFFF
C0000-C9FFF
A0000-BFFFF
9FC00-9FFFF
80000-9FBFF
00000-7FFFF
Size
Description
LAN PXE ROM
255 MB Extended memory
64 K
System BIOS
8 K
Main BIOS (available as UMB)
4 K
ESCD (plug and play configuration
area)
4 K
OEM (available as UMB)
48 K
BIOS Reserved (currently available
as UMB)
64 K
Available HI DOS memory
8 K
Flash Disk (optional)
8 K
NCR Trigantor MSR (optional)
16 K
Available HI DOS memory
40 K
On-board video BIOS
128 K
Reserved for video memory
1 K
Extended BIOS Data (moveable by
QEMM, 386MAX)
127 K
Extended conventional
512 K
Conventional
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