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Intel® Server Board SE7520JR2 Functional Architecture
Revision 1.0
C78844-002
71
3.5.1.1 DOS Compatibility Region
The first region of memory below 1 MB was defined for early PCs, and must be maintained for
compatibility reasons. The region is divided into sub-regions as shown in the following figure.
Figure 15. DOS Compatibility Region
= Mappable to PCI or ISA memory
= Main memory only
= PCI only
= Shadowed in main memory
000000h
07FFFFh
080000h
09FFFFh
0A0000h
0BFFFFh
0C0000h
0DFFFFh
0E0000h
0EFFFFh
0F0000h
0FFFFFh 1MB
960KB
896KB
768KB
640KB
512KB
0
System BIOS
Extended
System BIOS
A
dd-in Card BIOS and
Buffer Area
PCI/ISA Video or SMM
A
rea
ISA Window Area
DOS Area