Apple twentieth anniversary mac Service Manual

Make sure you use the right type and length of cable

To attach a SCSI device to your computer or to another device in the chain, always use SCSI cables that
are double-shielded, such as Apple SCSI cables. Never use printer-type RS-232 cables (commonly used
with DOS and Windows computers). Poor quality SCSI cables are often the cause of SCSI problems.

Avoid mixing brands and types of SCSI cables.

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).

For best results, use SCSI cables manufactured by Apple Computer.

Keep the cables between SCSI devices as short as possible. Cables 18 to 24 inches long are best.
PowerBook computers and some SCSI devices (particularly scanners) may not be able to work with
cables longer than 24 inches.

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