Apple PowerBook (2400c) - Manual (Page 38)

There are three types of PC Cards. The different types refer to the thickness
of the card. A Type I card is 3.3 millimeters (mm) thick, a Type II card is
5 mm thick, and a Type III card is 10.5 mm thick. Make sure you check the
documentation that came with your PC Card to verify that it is compatible
with your Macintosh PowerBook.
You can place a Type I or Type II card in either the upper or lower slot. You
can place a Type III card only in the lower slot. When a Type III card is in the
lower slot, you cannot use the upper slot. You may find it useful to get in the
habit of always using the lower slot first to make sure the card you are using is
properly inserted.
A special type of PC Card supports “zoom video,” a method of showing full-
motion video images in a window on the computer’s screen. This type of card
must be placed in the lower PC Card slot.
WARNING Make sure you only use cards that are designated by the
PC Card manufacturer as compatible with your Macintosh PowerBook.
If you use an incompatible card, you may damage the card or your
PowerBook. If you are not sure whether a PC Card is compatible with
your PowerBook, contact the PC Card manufacturer.
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