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  Description:  Get Disk Change Status      [AT] [PS/2]
 
  Returns the status of the change line, indicating whether the disk in the
  drive may have been replaced since the last disk access.
 
  Input                             Output
  ══════════════════════            ══════════════════════════════
  AH=16H                            If change line inactive
  DL=drive                            (disk has not been changed)
     00H-7FH floppy disk            Carry flag=clear
                                    AH=00H
                                    If change line active
                                      (disk may have been changed)
                                    Carry flag=set
                                    AH=06H
                                    -♦-