Apple PowerBook G3 - Manual (Page 25)

Inserting a PC Card
To insert a card, do this:
m Insert the card, connector first and label up, into the slot. Make sure the card is level.
A Type III PC Card or a
Zoomed Video card must be
inserted in the lower slot.
A Type I or Type II PC Card can be
inserted in either the upper or lower slot.
25 Using Expansion Bay Modules and PC Cards