Epson EQUITY 3865X/20 PLUS - Manual (Page 171)

Locate the diskette drive ribbon cable; one end is connected
to the top diskette drive and the other end is free. Use the
connector in the middle of the cable to connect the second
diskette drive. As shown in the next illustration, there is a
large slot in this connector with a small plastic divider near
one end of the slot.
The interface that protrudes from the back of the drive has
gold contacts on both sides. Near one end of the interface,
there is a gap to accommodate the plastic divider on the
connector.
2. Align the connector with the interface so that the plastic
divider on the connector lines up with the gap in the
interface.
divider
gap
Installing and Removing Disk Drives
7-27