Apple 6400 appendix Scsi terminator

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.

mMake 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 computer’s main logic board, which is the first device in the chain, has a built-in terminator.

Some external SCSI devices from manufacturers other than Apple have built-in terminators. (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

If your SCSI device has a built-in terminator, use it as your last device in the chain or have your Apple-authorized service provider remove the extra built- in terminator. You can attach or remove external terminators yourself.

Connecting Equipment and Expanding Your Computer 55