NCR NCR7454 manual Memory Map Pentium III/Celeron

Chapter 3: Setup 3-19

Memory Map (Pentium III/Celeron)

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)	Size	Description
FECFF000-FECFF01B	27	LAN PXE ROM
100000-10000000	255 MB	Extended memory
F0000-FFFFF	64 K	System BIOS
EE000-EFFFF	8 K	Main BIOS (available as UMB)
ED000-EDFFF	4 K	ESCD (plug and play configuration
		area)
EC000-ECFFF	4 K	OEM (available as UMB)
E0000-EBFFF	48 K	BIOS Reserved (currently available
		as UMB)
D0000-DFFFF	64 K	Available HI DOS memory
CE000-CFFFF	8 K	Flash Disk (optional)
CC000-CDFFF	8 K	NCR Trigantor MSR (optional)
C0000-CAFFF	42 K	Onboard video BIOS
A0000-BFFFF	128 K Reserved for video memory
9FC00-9FFFF	1 K	Extended BIOS Data (moveable by
		QEMM, 386MAX)
80000-9FBFF	127 K	Extended conventional
00000-7FFFF	512 K	Conventional