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INT 2F U - DOS v5.0 - SINGLE-FLOPPY LOGICAL DRIVE CHANGE NOTIFICATION
        AX = 4A00h
        CX = 0000h
        DH = new drive number
        DL = current drive number
Return: CX = FFFFh to skip "Insert diskette for drive X:" message
Note:   called by MSDOS 5.00 IO.SYS just before displaying the message
          "Insert diskette for drive X:" on single-floppy systems
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