IBM RT PC Options Installation page 132

TNL SN32-9003 (August 87) to 75X0217
IBM RT PC 8MB Fast Memory Expansion Option
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The IBM RT PC 8MB Fast Memory Expansion Option is designed for
use only with the IBM RT PC Advanced Processor Card (APC).
The IBM R T PC 8MB Fast Memory Expansion Option can be identified
by the inscription "8MB Enhanced ECC Memory."
Warning: You must install this memory option in board slots C or D.
Installing: When the IBM RT PC 8MB Fast Memory Expansion Option
is used alone, it should be installed in slot C.
When the IBM R T PC 8MB 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 R T PC Advanced Card.
See the system unit diagram for the correct adapter slot.
Section 5. Memory Options 5-11