Apple Macintosh Performa 6400 Series - Manual (Page 54)

Before you connect a device
Before you connect a SCSI device to your Macintosh, complete these tasks:
m Make sure each SCSI device connected to your Macintosh has its own
unique ID number from 0 to 6. The computer itself (the main logic board
inside it) has the ID number 7 and the internal CD-ROM drive has the
ID number 3, making the ID numbers 0, 1, 2, 4, 5, and 6 available for
additional SCSI devices. Make sure other SCSI devices you add to the
chain do not use ID numbers 3 or 7. See the instructions that came
with each SCSI device for information on checking and setting its SCSI
ID number.
IMPORTANT If you use two or more devices attached to the same SCSI
interface with the same ID number, your equipment could malfunction and
you could lose data as a result.
m Make sure you have the appropriate cable for attaching the SCSI device to
your Macintosh.
If the device is the first or only one you’re connecting, use a SCSI system
cable to connect it to the computer’s SCSI port:
If the device is not the first one, use a SCSI peripheral interface cable to
connect it to the last device in the chain:
SCSI peripheral interface cable
SCSI system cable
54 Chapter 3