Legacy Address Range; Dos Range (0H-9_Ffffh); Dos Legacy Address Range - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 2 01-2011 Datasheet

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
Figure 2-2.

DOS Legacy Address Range

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.
18
000F_FFFFh
System BIOS (Upper)
000F_0000h
000E_FFFFh
Extended System BIOS (Lower)
64 KB (16 KB x 4)
000E_0000h
000D_FFFFh
Expansion Area
128 KB (16 KB x 8)
000C_0000h
000B_FFFFh
Legacy Video Area
(SMM Memory)
000A_0000h
0009_FFFFh
DOS Area
0000_0000h
Processor Configuration Registers
1 MB
64 KB
960 KB
896 KB
768 KB
128 KB
640 KB
Datasheet, Volume 2