Epson EQUITY 386/33 PLUS - Manual (Page 93)

Changing the Jumper Settings
The hard disk drive jumpers are usually located on the drive’s
circuit board, near the large cable connector.
jumpers
The instructions in this section describe setting the jumpers on
the standard Epson 120MB hard disk drive. The jumpers on
your drive may be in a slightly different location, but you set
them the same way. See the documentation that came with
your hard disk drive for the proper settings.
There are three positions for the jumpers on the Epson 120MB
hard disk drive.
installing and Removing Drives 5-5