IBM 5280 User's Setup Manual page 108

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The diskette drive slot is where you insert the diskette when instructed
by the system checkout procedure. Slide the diskette all the way into the
slot, with the label on the left.
• The diskette drive label contains information that you will need during the
system checkout procedure. The top two digits indicate the type of
diskette drive. The IBM 5280 Distributed Data System may have either a
compact diskette drive supporting diskette 1, a compact diskette drive
supporting diskette 20, or a combination of the two types of diskette
drives. The two types look and function the same. The system checkout
procedure will ask you which type you have. Throughout the system
checkout procedure, these diskette drives will be referred to as a diskette
1 drive or a diskette 20 drive.
The bottom four digits indicate the device address. There are eight
possible device addresses: 4000, 4400, 4800, 4COO, 5000, 5400, 5800,
or 5COO. The system checkout procedure will instruct you to find and
use each diskette drive on your system. The system checkout procedure
will ask you to key these device address numbers on some display
screens.
• The diskette insertion decal is a reminder to you that the diskettes are to
be inserted in the slot with the diskette label on the locking lever side
(your left) and the diskette label going into the slot last .
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User's Setup Procedures 101