IBM 5150

14 This message appears:
Insert source diskette in drive A
Strike any key when ready
Because the DOS Diskette (the "source diskette") is
already in drive A:, you do not need to exchange
diskettes.
15 Press .a key.
16 Now this message is displayed:
Insert target diskette in drive A
Strike any key when ready
Before touching any key:
16A Remove the DOS Diskette.
16B Insert the back-up diskette. This is the "target
diskette" .
16C Now press a key to tell DOS the right diskette
has been inserted.
DOS 3-26