IBM 5280 User's Setup Procedures page 48

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12. If you are not attaching a diskette drive cable, go to step 13.
If you are, 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.
c. Position the cable so that the yellow label is on top; then push
the cable end into the socket.
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Yellow Label
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d. Make sure that the snap-locks lock into position.