IBM Personal Computer XT Manual To Operations page 265

Switch Setting Charts
Use the illustrations below to determine which system board
is in your system unit.
• A 64KB-256KB system board has a "B" stamped
on the rear panel and 64KB-256KB CPU printed on
the system board. If you have this system board,
go to page 5-28.
• A 16KB-64KB system board has no identification
on the rear panel and 16KB-64KB CPU is printed
on the system board. If you have this system
board. go to page 5-2.
Rear Panel
64KB-256KB CPU Stamp
B
No "B" stamp indicates a 16KB-64KB CPU.
o
0
~ ~ ~ ~ ~~Dm ~
~ ~ ~ ~ ~ u
U
~I ~~~ID
[=
DDD DOD
[Q~~]nOJOilO]]
0DOD DOD
o ~DDDDDDD
DDDDDDD
o
DDDDDDDD 0000000
o
00000000 DODDDDD
April 1983
System Board
Copyright IBM Corp. 1983
(Top View)
Switch Settings 1