IBM RT PC Options Installation page 130

TNL SN32-9003 (August 87) to 75X0217
IBM RT PC 4MB Memory Expansion Option
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The IBM R T PC 4MB Memory Expansion Option is designed for use
only with the IBM RT PC Processor and Memory Management Card.
Warning: You must install this memory option in system board slot C
or D.
Installing: When the IBM RT PC 4MB Memory Expansion Option is
used alone, it should be installed in slot C.
When the IBM R T PC 4MB Memory Expansion Option is used with a
second memory option, the smaller capacity memory option should be
installed in slot D. Both memory options must be designed for use with
the IBM RT PC Processor and Memory Management Card.
See the system unit diagram for the correct adapter slot.
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Section 5. Memory Options 5-9