JG82855GMESL7VN Datasheet, PDF (125/213 Pages) Intel Corporation – Intel® 855GM/855GME Chipset Graphics and Memory Controller Hub (GMCH)

Intel® 855GM/GME GMCH System Address Map
R
Figure 7. Detailed View of System Address Map
PCI Memory
Range
Optional ISA
Hole
DOS
Compatibility
Memory
4 GB max
TOM
1 GB
16 MB
15 MB
1 MB
640 kB
0B
0FFFFFh SBIOS ^{1 MB}
Upper
BIOS Area
0F0000h (64 kB)
0EFFFFh
Extended
SBIOS Lower
960 kB
0E0000h
0DFFFFh
BIOS Area ( 64
kB) 16 kB x 4
Expansion 896 kB
Card
BIOS and
Buffer Area
(128 kB)
16 kBx8
0C0000h
0BFFFFh
DOS
Compatibility
Memory
Standard
PCI/ISA
Video
Memory
(SMM
Memory)
128 kB
768 kB
0A0000h
09FFFFh
640 kB
DOS Area
000000h
5.2
DOS Compatibility Area
This compatibility region is divided into the following address regions:
• 0 – 640-kB DOS Area
• 640 – 768-kB Video Buffer Area
• 768 – 896 kB in 16-kB sections (total of eight sections) - expansion area
• 896 – 960 kB in 16-kB sections (total of four sections) - extended system BIOS area
• 960 kB – 1-MB system BIOS area
There are 16 system memory segments in the compatibility area. Thirteen of the system memory
ranges can be enabled or disabled independently for both Read and Write cycles.
Datasheet
125