Epson Equity 320SX PLUS - Manual (Page 99)

Both the diskette drive and hard disk drive sockets are
located on the main system board on the left side of the
subassembly, as shown below.
Both sockets have a notch on one side. Connect the
diskette drive cable first. As shown below, there is a tab
on one side of the connector.
diskette drive connector
t a b
diskette drive socket
Accessing Internal Components 5-15