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Memory map – Gateway ALR 8300 User Manual

Page 109

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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