IBM 3274 Planning, Setup, And Customizing Manual page 93

5-10
3274 Diskette Insertion Procedure (Model 51C)
1. Open the diskette reader by turning the operator knob counterclockwise.
2. Remove the diskette to be used with the 3274 from its gray protective envelope, and insert it
squarely into the enclosure. Note that diskette label position is on your left.
3. Close the diskette reader by turning the operator knob clockwise until it is horizontal.
Figure 5-3 (part 2 of 2). Inserting a Diskette into the 3274 Control Unit