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  Description:  Controller RAM Diagnostic      [PC]
 
  Causes the fixed disk adapter to carry out a built-in diagnostic test on
  its internal sector buffer, indicating whether the test was passed by the
  returned status.
 
  Input             Output
  ══════            ════════════════════════════════════
  AH=12H            If function successful
                    Carry flag=clear
                    If function unsuccessful
                    Carry flag=set
                    AH=status (see Int 13H Function 01H)
                                    -♦-