Intel E3-1275 Datasheet Page 18

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Processor Configuration Registers
18 Datasheet, Volume 2
2.3.1 Legacy Address Range
This area is divided into the following address regions:
0–640 KB – DOS Area
640–768 KB – Legacy Video Buffer Area
768–896 KB in 16 KB sections (total of 8 sections) – Expansion Area
896–960 KB in 16 KB sections (total of 4 sections) – Extended System BIOS Area
960 KB–1 MB Memory – System BIOS Area
2.3.1.1 DOS Range (0h–9_FFFFh)
The DOS area is 640 KB (0000_0000h–0009_FFFFh) in size and is always mapped to
the main memory controlled by the MCH.
Figure 2-2. DOS Legacy Address Range
Expansion Area
128 KB (16 KB x 8)
000C_0000h
000D_FFFFh
896 KB
Extended System BIOS (Lower)
64 KB (16 KB x 4)
000E_0000h
000E_FFFFh
960 KB
Legacy Video Area
(SMM Memory)
128 KB
000A_0000h
000B_FFFFh
768 KB
DOS Area
0000_0000h
0009_FFFFh
640 KB
System BIOS (Upper)
64 KB
000F_0000h
000F_FFFFh
1 MB
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