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0661-371
Electrical interface specifications
  
The model 0661-371 disk drive uses single-ended drivers and receivers that permit cable lengths of up to 6 meters (19.68 feet).

Connectors

The drive has two connectors: one for power, the other for connecting to the SCSI bus.

Power

The DC power connector is designed to mate with AMP part number 1-480424-0 using AMP pins part number 350078-4 or their equivalent. Pin assignments are shown in Figure 2.

DC power connector
Figure 2 power connector pin assignments

SCSI signal connector
 
The SCSI signal connector is a 50-pin connector, Molex part number 70248 or equivalent, meeting ANSI/SCSI specifications.
Connector locations

SCSI bus terminators

The drive has no internal SCSI bus terminators. The user is responsible for properly terminating and powering the SCSI bus in the system.

AMP part number 88-4163-081-1, DATA MATE DM500-06-8, or equivalent external terminator may be used.

For a single-ended cable, a 50-conductor flat cable or a 25 twisted pair cable can be used, with a maximum length of 6.0 meters and a stub length not to exceed 0.1 meters.

The drive has an internal stub length of 0.077 meters. The SCSI bus cable must not add more than 0.023 meters additional stub length to remain compliant with ANSI.


SCSI bus electrical characteristics

Note: The drive incorporated the Western Digital WD33C93A SCSI interface controller and conforms to the ANSI/SCSI interface standard.
  
 





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