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Chapter 5 Appendix
5-1 Memory Map
Address range
Size
Description
00000-7FFFF
512K Conventional memory
80000-9FBFF
127K Extended conventional memory
9FC00-9FFFF
1K
Extended BIOS data area if PS/2 mouse is
installed
A0000-C7FFF
160K Available for hi DOS memory
C8000-DFFFF
96K
Available for hi DOS memory and adapter
ROMs
E0000-EEFFF
60K
Available for UMB
EF000-EFFFF
4K
Video service routine for monochrome &
CGA adapter
F0000-F7FFF
32K
BIOS CMOS setup utility
F8000-FCFFF
20K
BIOS runtime service routine (2)
FD000-FDFFF
4K
Plug and play ESCD data area
FE000-FFFFF
8K
BIOS runtime service routine (1)