Memory Map

The following table gives descriptions of what the memory is used for at each address location.

Address (Dec-

Address

Size

Description

imal)

(Hexadeci-

 

 

 

mal)

 

 

 

 

 

 

0-KB–640-KB

0000:0000–

640-KB

Main memory for

 

0009:FFFF

 

applications.

 

 

 

 

640-KB–

000A:0000–

128-KB

Video graphics dis-

768-KB

000B:FFFF

 

play buffer

 

 

 

 

768-KB–

000C:0000–

128-KB

Reserved for ROM on

896-KB

000D:FFFF

 

I/O adapters

 

 

 

 

896-KB–

000E:0000–

128-KB

System BIOS ROM

1024-KB

000F:FFFF

 

 

(1-MB)

 

 

 

 

 

 

 

Above 1-MB

 

 

 

 

 

 

 

1-MB–16-MB

0010:0000–

15-MB

Extended Memory

 

00FF:FFFF

 

 

 

 

 

 

15-MB–16-MB

00FE:0000–

64-KB

Mapped RAM or ROM

 

00FF:FFFF

 

 

 

 

 

 

Above 16-MB

 

 

 

 

 

 

 

16MB–

0100:0000–

1-GB

Total accessible

1024-MB

3FFF:FFFF

(minus

extended memory

(1-GB)

 

16-MB)

above 16-MB

 

 

 

 

128-MB–

0800:0000–

3966-M

Mapped to ISA slots

4084-MB

FFFD:FFFF

B

 

(4GB minus

 

 

 

2MB)

 

 

 

 

 

 

 

4-GB minus

FFFF:0000–

64-KB

System BIOS ROM

64KB–4-GB

FFFF:FFFF

 

 

 

 

 

 

Reference Data 97