Apple PowerBook (2400c) - Manual (Page 37)

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Read this chapter for information on
expanding your computer system with
PC Cards or additional hardware.
Using PC Cards (PCMCIA cards)
PC Cards (also known as PCMCIA cards) are about the size of a thick credit
card and have a 68-pin connector at one end. They come in many varieties,
such as fax/modem cards, mass-storage cards, Ethernet connection cards, and
wireless communication cards. You can use PC Cards to expand your
Macintosh PowerBook’s capabilities.
This section tells you how to insert and eject PC Cards, and how to set up
your communications software to use PC Card modems. For information on
using PC Cards, see the “Using PC Cards” topic area of Mac OS Guide,
available in the Guide (h) menu.
Your Macintosh PowerBook has two PC Card slots: an upper slot and a lower
slot. You can insert a card into either slot, or you can use both slots
simultaneously.
3
Using PC Cards and Additional Equipment