5Make sure that the last (or only) device in the SCSI chain has a terminator. Make sure that no other external SCSI device has a terminator.

To ensure accurate transmission of information, a terminator must be at each end of a SCSI chain. Your internal hard disk, which is the first device in the chain, has a built-in terminator.

Some external SCSI devices from manufacturers other than Apple have a built-in terminator. (Check the information that came with the device.) If the device at the end of the SCSI chain does not have a built-in terminator, you need to attach an external terminator.

SCSI terminator

Have your Apple-authorized service provider remove any extra built-in terminators. You can attach or remove external terminators yourself.

Tip: If only one external device has a built-in terminator, rearrange the SCSI chain so that device is at the end.

IMPORTANT Always turn on any external SCSI devices connected to your Macintosh before turning on the computer itself. Otherwise, your computer cannot recognize the SCSI devices.

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Apple 8100/80AV manual Scsi terminator