Apple PC Compatibility Card 12-inch card - Manual (Page 55)

Connecting the CD audio cables
8 Unplug the CD audio cable from the computer’s logic board and the CD-ROM drive.
You will be replacing the cable with one that came with your PC
Compatibility Card.
Disconnect the CD cable
from the back of the
CD-ROM drive
and from the
computer’s main
logic board.
(back of computer)
41 Installing the Card in a Power Macintosh 8500 or 9500