Specifications

Checking that the SCSI chain is properly terminated

To ensure accurate transmission of information, a chain of SCSI devices must

have a terminator at each end. Terminators are built into some SCSI devices

and can also be added externally.

m Your PowerBook’s internal hard disk, which is the first device in the chain,

has a built-in terminator. However, you should also add external

terminators as described in these instructions.

m External SCSI devices from Apple do not have built-in terminators.

m External SCSI devices from other vendors may have built-in terminators;

see the documentation that came with the device.

If you are attaching one SCSI device

Make sure that there is

m an external terminator between the system cable and the SCSI device

and

m a terminator (internal or external) on the SCSI device.

If you are attaching more than one SCSI device

Make sure that there is

m a terminator (internal or external) on the last SCSI device; and

m no other terminators (internal or external) or other external devices in the

chain.

If you have too many devices with internal terminators, your Apple-

authorized service provider can remove extra terminators.

Chain configurations are shown in the illustration in step 6 of the following

section.

SCSI terminator

Chapter 8