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  Interrupt:   13h     Function:   16h
 
  Title:       Get Disk Change Status
 
  Description:                                               [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
                                    -♦-