Nikon 35mm User Manual page 40

Typically, the scanner will be the only peripheral on the internal
SCSI bus. If this is the case, the 50-pin cable provided will work.
In some cases, the scanner will not be the only peripheral on
the internal SCSI bus. When this occurs, the SCSI cable
provided will not work. A special cable with a connector
stamped in the center of the cable as well as a connector
stamped on both ends of the cable will be required. This
special cable is shown below.
SCSI flat cable (not provided)
SCSI 50-pin connectors
Connector orientation key
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