IBM 5280 User's Setup Procedures page 33

11. If the 5282 has a diskette drivels), go to step 12. If not, go to
step 14.
12. 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.
b. Find a cable connector with a yellow label. Read the
identification label to be sure that it connects to the 5282.
User's Setup Procedures 27