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  Interrupt:   13h     Function:   14h
 
  Title:       Controller Internal Diagnostic
 
  Description:                                          [PC] [AT] [PS/2]
 
     Causes the fixed-disk adapter to carry out a built-in diagnostic
     self-test, indicating whether the test was passed by the returned
     status. This function is supported on fixed disks only.
 
     Input        Output
 
     AH = 14h     If function successful
                    Carry flag: clear
                    AH = 00h
 
                  If function unsuccessful
                    Carry flag: set
                    AH = Status
                         See: Int 13h Function 01h
                                    -♦-