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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. 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 device for information on
checking and setting its ID number.
IMPORTANT
If you use two or more devices attached to the SCSI interface
with the same ID number, your equipment could malfunction and you could
lose data.
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:
IMPORTANT
The total length of the cables in a SCSI chain should not exceed
6 meters (about 20 feet). SCSI cables must have a 110-ohm impedance. For
best results, use SCSI cables manufactured by Apple Computer.
SCSI peripheral interface cable
SCSI system cable
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Expanding Your Computer and Using Its Special Features