Epson Equity 386/33 PLUS User Manual page 111

6. Locate the hard disk drive ribbon cable that you removed
from the drive in the vertical mounting position. Follow the
instructions below to attach the connector in the middle of
this cable to the horizontal hard disk drive.
As shown below, there are two rows of holes in the
connector. One of the holes is blocked with a plastic plug.
blocked hole
Notice the ribbon cable socket on the back of the drive; you
see two rows of pins. In one of the rows, a pin is missing.
Installing and Removing Drives 5-23