Appendix 105
Memory map
Address
(Decimal)
Address
(Hexadecimal)
Size Description
0-KB–640-KB 0000:0000–
0009:FFFF
640-KB Main memory for user
applications.
640-KB–768-KB 000A:0000–
000B:FFFF
128-KB Video graphics display
buffer
768-KB–896-KB 000C:0000–
000D:FFFF
128-KB Reserved for ROM on
I/O adapters
896-KB–
1024-KB (1-MB)
000E:0000–
000F:FFFF
128-KB System BIOS ROM
Above 1-MB
1-MB–16-MB 0010:0000–
00FF:FFFF
15-MB Extended Memory
15-MB–16-MB 00FE:0000–
00FF:FFFF
64-KB Mapped RAM or ROM
Above 16-MB
16MB–
1024-MB (1-GB)
0100:0000–
3FFF:FFFF
1-GB
(minus
16-MB)
Total accessible
extended memory
above 16-MB
128-MB–
4084-MB
(4GB minus
2MB)
0800:0000–
FFFD:FFFF
3966-MB Mapped to ISA slots
4-GB minus
64KB–4-GB
FFFF:0000–
FFFF:FFFF
64-KB System BIOS ROM
4077.boo Page 105 Thursday, January 21, 1999 9:48 AM
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