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The following figure is a system memory map.
Address
Name
000000
07FFFF
to
512K system
board
080000 to
128K
09FFFF
OAOOOO to
128K video
OBFFFF
RAM
oeoooo
to
128K I/O
ODFFFF
expansion ROM
OEOOOO to
64K reserved
OEFFFF
on system board
OFOOOO to
64K ROM on the
OFFFFF
system board
100000 to
Maximum
FDFFFF
memory 15M
FEOOOO to
64K reserved
FEFFFF
on system board
FFQOOO to
64K ROM on the
FFFFFF
system board
System Memory Map
Function
System board memory
I/O channel memory - IBM Personal
Computer AT 128K Memory Expansion
Option
Reserved for graphics display buffer
Reserved for ROM on I/O adapters
Duplicated code assignment at
address FEOOOO
Duplicated code assignment at
address FFOOOO
I/O channel memory - 512K to 15M
installed on memory expansion options
Duplicated code assignment at
address OEOOOO
Dupl icated code assignment at
address OFOOOO
1-8
System Board
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