IBM RT PC Options Installation page 131

TNL SN32-9003 (August 87) to 75X0217
IBM RT PC 4MB Fast Memory Expansion Option
5-10 Options Installation
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The IBM RT PC 4MB Fast Memory Expansion Option is designed for
use only with the IBM R T PC Advanced Processor Card (APC). The
IBM RT PC 4MB Fast Memory Expansion Option can be identified by
the inscription "4MB Enhanced ECC Memory."
Warning: You must install this memory option in system board slot C
or D.
Installing: When the IBM RT PC 4MB Fast Memory Expansion Option
is used alone, it should be installed in slot C.
When the IBM RT PC 4MB Fast 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 Processor Card.
See the system unit diagram for the correct adapter slot.