IBM 5280 User's Setup Procedures page 18

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d. Make sure that the snap-locks lock into position.
9. If the 5281 has a diskette drive(s), go to step 10. If not, go to
step 11.
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.
b. Find a cable connector with a yellow label. Read the
identification label to be sure that it connects to the 5281.