Apple PowerBook 165 - Manual (Page 145)

Upgrades PSRAM Expansion Card - 7
Caution:
An incorrectly
installed PSRAM card could
damage the daugherboard.
Note that the expansion
connector and the PSRAM
card are keyed for proper
installation. Do not force
the card into the connector,
thereby defeating the key.
Caution:
When installing
the card, press down on the
edge directly above the
connector. Be careful not to
apply pressure to any
components or you may
permanently damage the
card.