Apple PC Compatibility Card - Manual (Page 108)

24 Insert the larger plug on the other SCSI audio cable into the back of the CD-ROM drive.
For most models of the 8600 and 9600, you can use the SCSI audio cable,
which has a thick plug and looks identical to the cable you connected to the
logic board.
Try inserting this plug into the back of the CD-ROM drive, where you just
unplugged the ribbon cable.
If the plug looks too thick and does not easily fit into the back of the
CD-ROM drive, your computer may have a different kind of drive. Try using
the ATAPI CD audio cable, with the thinner, slightly smaller plug.
108 Chapter 4