Apple Power Macintosh 7300 series - PC Compatibility Card - Manual (Page 109)

What you do next depends on whether you are installing a PC Serial and
Parallel Card.
m If you want to install a PC Serial and Parallel Card, you need to connect the
peripheral flex cable to your PC Compatibility Card now. See the PC Serial
and Parallel Card manual for instructions. Then return to this manual and
go on to the next section, “Inserting the PC Compatibility Card.”
m If you don’t want to install a PC Serial and Parallel Card, go on to the next
section.
Gently swing the top part of the chassis
up so that it rests on the support foot.
Support arm
Be sure that the support arm engages this hole on the floor of
the bottom chassis so that the top chassis is locked in place.
109 Reinstalling the PC Compatibility Card in Your Power Macintosh 7300 Computer