IBM Personal Computer Manual To Operations page 268

Extender Card Switches
Set the switches on the Extender Card to reflect total
system memory.
Extender Card Switch Settings
1 2 3 4 1 2 3 4
16K to 64K 352K to 384K
~~~~~
~~u~~
1 2 3 4
1 2 3 4
96K to 128K
416K to 448K
~~~~~
~~~~~
1 2 3 4
1 2 3 4
160K to 192K 480K to 512K
~~~~~
~~~~~
1 2 3 4
1 2 3 4
224K to 256K
544K to 576K
~~~~~
~~~u~
1 2 3 4
1 2 3 4
288K to 320K
608K to 640K
~~~~u
~u~u~
5-50 Switch Settings