IBM 5280 User's Setup Manual page 20

10. Read the following four steps (a, b, c, and d) before
connecting the diskette drive cable.
a. Look at the diskette drive socket (with the yellow label). This is
where you will connect the diskette drive cable.
Green Label
"11
Diskette Drive Socket
b. Find a cable connector with a yellow label. Read the identification label
to be sure that it connects to the IBM 5281.
c. Position the cable so that the IBM logo is on top; then push the
cable end into the socket (make sure that the colors match).
Note: If you have trouble pushing the connector into the socket, make sure that
the connector guides line up with the socket guides.
User's Setup Procedures 13