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To terminate the last device in the chain, do one of the following:
m Use a device that has a built-in terminator as the last device in the chain.
If you wish to attach two or more SCSI devices that have built-in terminators, an Apple-
authorized service provider can remove the extra built-in terminators.
m If the device at the end of the SCSI chain does not have a built-in terminator, attach an
external terminator. You can attach or remove external terminators yourself. (Do not use a
black terminator; the black terminators are for Macintosh IIfx computers and certain
LaserWriter printers only.) Terminators are available at authorized Apple dealers.
Important Do not attach a terminator to a device that already has a built-in terminator. If
you do, your computer may not start up properly.
Exception to the “first and last” rule: If the total cable length in the chain is greater than 10
feet, the chain may need a third terminator at the 10-foot point. Do not add the third
terminator unless you are experiencing a SCSI problem, and check all other possible causes
of the problem before adding the third terminator.
Connecting a SCSI Device
After you read “Before You Connect a SCSI Device” earlier in this chapter, follow the
instructions below. Use these general instructions in conjunction with the more specific
instructions that came with your SCSI device.
1 Shut down your Macintosh and make sure the SCSI device is switched off.
2 Use a SCSI cable to connect the device either to the computer’s SCSI port or to the last SCSI
device already in the chain.
Use the thumbscrews and metal clips on the connectors to make a tight, reliable connection.
Do not overtighten the thumbscrews.
Warning Do not connect or disconnect any device while the device or your
Macintosh is turned on. Doing so could damage the device, your computer, or both.
Do not attach or remove a terminator while the computer or any device is turned on.
External SCSI terminator
34 Chapter 2