IBM 5280 User's Setup Manual page 34

11. If the IBM 5282 has a diskette drive(s), 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.
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b. Find a cable connector with a yellow label. Read the
identification label to be sure that it connects to the IBM 5282.
User's Setup Procedures 27