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Technical Reference Guide
Figure 3-4 shows the system memory map.
4 GB
Option ROM
(128 KB)
0000 0000h
Base Memory
(512 KB)
Fixed Mem. Area
(128 KB)
Graphics/SMRAM
RAM (128 KB)
High BIOS Area
(2 MB)
Host/PCI Memory
Expansion
(496 MB)
FFFF FFFFh
System BIOS Area
(64 KB)
Extended BIOS
Area
000F 0000h
000E FFFFh
0010 0000h
000F FFFFh
Extended Memory
(15 MB)
1FFF FFFFh
2000 0000h
PCI Memory
Expansion
(3060 MB)
FEBF FFFFh
FEC0 0000h
FEC1 0000h
FEC0 FFFFh
APIC Config. Space
(64 KB)
PCI Memory
(18 MB)
Host,
PCI, AGP Area
0100 0000h
00FF FFFFh
FFE0 0000h
FFDF FFFFh
512 MB
16 MB
Host, PCI,
ISA Area
1 MB
000E 0000h
000D FFFFh
000B FFFFh
000C 0000h
DOS Compatibility
Area
0009 FFFFh
000A 0000h
640 KB
512 KB
0007 FFFFh
0008 0000h
NOTE:
All locations in memory are cacheable. Base memory is always mapped to DRAM. The next 128 KB
fixed memory area can, through the north bridge, be mapped to DRAM or to PCI space. Graphics RAM area is
mapped to PCI or AGP locations.
Figure 3–3. System Memory Map
Compaq Evo and Workstation Personal Computer
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
3-7