Apple Mac 8600 - Manual (Page 31)

Basics Ultra Wide SCSI - 29
factory, as well as the PCI SCSI card itself, have already
reserved certain SCSI ID numbers on the Ultra Wide SCSI-3
bus. Other ID numbers are available for assignment to SCSI
devices that are added later, as shown below.
SCSI ID # Device
0 Factory-installed hard drive(terminated)
1 Second factory-installed hard drive (optional)
2 - 6 Available
7 SCSI PCI card (terminated)
8 - 15 Available
IMPORTANT
: The factory-installed internal hard drive and
the SCSI card are both terminated. Other SCSI devices that
you install and connect to the Ultra Wide SCSI-3 bus must
not be terminated. If you connect a terminated device to the
internal SCSI interface, you may severely damage the logic
board.