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386 Real Mode Address
Low
High
Base Memory
Upper Memory
Interrupt Vector(256*4B=1024B)
00000H
003FFH
BIOS Data Area(512B)
005FFH
00600H
Boot Sector(512B)
07C00H(31K Start)
Boot Sector Entry
Extended BIOS Data Area(1~4K,usually 1K)
9FFFFH
A0000H (640K Start)
EGA/VGA/XGA/XVGA Graphic Video buffer
MDA Mono Text Video Buffer
CGA/EGA+ Chroma Text Video Buffer
B0000H(704K Start)
B8000H(736K Start
C0000H(768K Start)
C8000H
VGA BIOS ROM
BIOS Boot Block
System BIOS Routine
CC000H
IDE BIOS ROM
F0000H(960K Start)
Other Adapter BIOS ROM
FFFFFH
FE000H
FFFF0H
BIOS Boot Strap
High Memory Area(A20 on)
10FFEFH
PC BIOS Code and Data Layout
E0000H
System BIOS Plug and Play Extended Information