Apple Power Macintosh 7600/120 Series - Manual (Page 150)

You can install printed circuit boards (called cards) for video and graphics
applications, networking and communications, additional processing power,
or other purposes. The cards fit into connectors, called expansion slots, inside
the computer.
Your Macintosh has three expansion slots, each designed to accept a
Peripheral Component Interconnect (PCI) card. Install only expansion cards
that come with Macintosh drivers and are compliant with the PCI 2.0
standard. NuBus
™ cards cannot be used in these expansion slots. There is also
an expansion slot that contains the computer’s processor card. (The processor
card can be upgraded by replacing it with a more powerful processor card.)
WARNING To avoid damaging your computer and expansion card, do not
attempt to install any expansion card without first checking the
documentation for that card. If the documentation specifies that an
Apple-certified technician must install the card (usually because the
installation requires special training or tools), consult the service and
support information that came with your computer for instructions on
how to contact an Apple-authorized service provider or Apple for
assistance. If you attempt to install the card yourself, any damage you
may cause to the computer or card will not be covered by the limited
warranty on your computer. If the card is not an Apple-labeled product,
check with an Apple-authorized dealer or service provider to see if you
can install it yourself.
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Appendix B
Installing an Expansion Card
Read this appendix for instructions
on installing an expansion card
in your computer.