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  Description:  Controller Internal Diagnostic      [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.
 
  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)
                                    -♦-