Epson EQUITY 386SX/16 PLUS - Manual (Page 139)

Changing the Jumper Settings
The hard disk drive jumpers are located on the drive’s circuit
board, near the large cable connector.
cable connector
The jumpers on your drive may be in a slightly different
location, but you set them the same way.
There are four positions for the jumpers on each hard disk
drive. Jumpers are installed in only two of the positions and
the other two positions are left open.
Installing and Removing Disk Drives B-5