Apple Power Macintosh 7300 series - PC Compatibility Card - Manual (Page 110)

Inserting the PC Compatibility Card
12 Prepare the first PCI expansion slot.
You need to install your PC Compatibility Card in the first PCI expansion
slot, the slot closest to the center of the computer.
m If there is already a card in the first slot, move it to a different slot. If you
will be installing a PC Serial and Parallel Card, you should also remove
any card in the second slot (next to the first slot).
IMPORTANT Always hold PCI cards by their edges. Don’t touch any of the
components on the cards.
m If there is a port access cover installed, remove it.
(back of computer)
Port access opening to first slot
110 Appendix B