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2.Attach the 25-pin SCSI connector of the cable to the SCSI port on the back of the Macintosh computer. Make sure the cable connector is well seated by pressing it into place firmly, and then tighten both knobs on the 25-pin SCSI cable connector.
BACK OF MACINTOSH COMPUTER
25-pin SCSI Connector
Knobs
3-6 Installation (Hardware & Software) — Macintosh Computer G