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Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
3-7
Figure 3-3 shows the system memory map.
NOTE:
All locations in the 256 megabytes of system memory are cacheable in the L2 cache.
Figure 3–3. System Memory Map
High BIOS Area
(
256 KB
)
Extended Memory
(48 MB)
FFFF FFFFh
1 MB
Graphics ROM
(24 KB)
Upper BIOS Area
(64 KB)
Graphics/SMM Area
(128 KB)
Base Memory
(640 KB)
Lower BIOS Area
(64 KB)
Extended Memory
(
15 MB
)
FFFC 0000h
FFDF FFFFh
0100 0000h
00FF FFFFh
0010 0000h
000F 0000h
000E FFFFh
000C 5FFFh
000F FFFFh
0000 0000h
0009 FFFFh
000A 0000h
000B FFFFh
000C 6000h
000C 0000h
960 KB
768 KB
792 KB
640 KB
16 MB
4 GB
Host, PCI,
ISA Area
DOS Compatibility
Area
Unused 2 KB
Graphics ROM
(6 KB)
Unused 96 KB
000E 0000h
000D FFFFh
000C 8000h
000C 6800h
896 KB
800 KB
03FF FFFFh
1000 0000h
64 MB
Host,
PCI Area
Cacheable in L1
(192 MB)
PCI Memory
(2130 MB)
FFFB FFFFh
8100 0000h
80FF FFFFh
ISA Memory-Mapped
Devices (16 MB)
7FFF FFFFh
8000 0000h
PCI Memory
(1792 MB)
Op.TSEG (Cacheable)
(.1, .25, .5, 1 MB)
Op. Hi SMRAM
(384 KB)
0400 0000h
0FFF FFFFh
1000 0000h