Pc Bios Memory Layout
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High
High Memory Area(A20 on) BIOS Boot Block
10FFFFH FFFFFH FFFF0H
BIOS Entry
Upper Memory Block
FE000H(1016K Start)
BIOS Routine & Card BIOS
C0000H(768K Start) CGA/EGA+ Chroma text video buffer Mono text video buffer
B8000H(736K Start) B0000H(704K Start)
EGA/VGA/XGA/XVGA Graphic Video Buffer
386 Real Mode Address
Extended BIOS Data Area(usually 1K)
A0000H(640K Start) 9FFFFH 9FC00H
Base Memory
80000H(512K Start)
Boot Sector(512B)
BIOS Data Area Interrupt Vector(256*4B=1024B) Low
PC BIOS Memory Layout
07E00H 07C00H(31K Start) 07BFFH
00500H 00400H(1K Start) 003FFH 00000H
Boot Sector Entry
High Memory Area(A20 on) BIOS Boot Block
10FFFFH FFFFFH FFFF0H
BIOS Entry
Upper Memory Block
FE000H(1016K Start)
BIOS Routine & Card BIOS
C0000H(768K Start) CGA/EGA+ Chroma text video buffer Mono text video buffer
B8000H(736K Start) B0000H(704K Start)
EGA/VGA/XGA/XVGA Graphic Video Buffer
386 Real Mode Address
Extended BIOS Data Area(usually 1K)
A0000H(640K Start) 9FFFFH 9FC00H
Base Memory
80000H(512K Start)
Boot Sector(512B)
BIOS Data Area Interrupt Vector(256*4B=1024B) Low
PC BIOS Memory Layout
07E00H 07C00H(31K Start) 07BFFH
00500H 00400H(1K Start) 003FFH 00000H
Boot Sector Entry
