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00000HInterrupt Vector(256*4B=1024B) 003FFH
07C00H(31K Start) Boot Sector Entry
00400H(1K Start)
07BFFH
PC BIOS Memory Layout
A0000H(640K Start)9FFFFH
B0000H(704K Start)
EGA/VGA/XGA/XVGA Graphic Video Buffer
B8000H(736K Start)Mono text video buffer
C0000H(768K Start)CGA/EGA+ Chroma text video buffer
FFFFFHFFFF0H BIOS Entry
FE000H(1016K Start)BIOS Boot Block
BIOS Routine & Card BIOS
80000H(512K Start)
Boot Sector(512B)07E00H
Upp
er M
emor
y B
lock
Bas
e M
emor
y
386
Rea
l Mod
e A
ddre
ss
Low
High
00500HBIOS Data Area
Extended BIOS Data Area(usually 1K)9FC00H
High Memory Area(A20 on)10FFFFH
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