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Before you connect a device
Before you connect a SCSI device to your Macintosh, be sure to complete
these tasks:
m Make sure each SCSI device connected to your Macintosh has its own,
unique ID number from 0 to 6. If your computer came with the optional
CD-ROM drive installed, make sure other SCSI devices you add to the
chain do not use ID number 3. 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:
IMPORTANT
The total length of the cables in a SCSI chain should not exceed
6 meters (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