IBM RT User's Setup Manual page 346

2. Install each module with the notch facing the bottom edge of
the card, as shown in the following drawing:
3. Align the pins of each module with the connector on the card
and press each of the 16 modules in place.
Go to "IBM PC Graphics Memory Expansion Card" on page 7-10 to
install the expansion card.
W arning: You must install this adapter in adapter slot 3 or 6
in IBM 6150 and in slot 1 in IBM 6151.
See the system unit diagram for the correct adapter
Installing:
slot.
The Notch Faces the
Bottom of the Card
Section 7. Display Adapter Options 7-13
AJZIF169
AJZIF170