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Reference Data 97
Memory Map
The following table gives descriptions of what the memory is used for at
each address location.
Address (Dec-
imal)
Address
(Hexadeci-
mal)
Size Description
0-KB–640-KB 0000:0000–
0009:FFFF
640-KB Main memory for
applications.
640-KB–
768-KB
000A:0000–
000B:FFFF
128-KB Video graphics dis-
play 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-M
B
Mapped to ISA slots
4-GB minus
64KB–4-GB
FFFF:0000–
FFFF:FFFF
64-KB System BIOS ROM
4081TL.book Page 97 Tuesday, December 22, 1998 1:27 PM