Black Box 2 x 2 SCSI Matrix Switch SC121A User Manual page 50

CHAPTER 6: SCSI Technical Information
To access jumper options:
Remove the four screws on the bottom of the unit. Then lift off the cover.
Figure 6-1. SCSI Switch component placement.
• Internal termination jumper block: E13, E14, E19, E20 on SC120A-R2 or
E15, E16, E21, E22 on SC121A (see Section 5.3).
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