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  Interrupt:   21h     Function:   0Ch
 
  Title:       Flush Input Buffer and Then Input
 
  See also:    Character Input, Direct Console I/O,
               Buffered Keyboard Input
 
  Description:
 
     Clears the standard input buffer and then invokes one of the
     character input functions. Input can be redirected.
 
     Input                                  Output
 
     AH = 0Ch                               If called with AL = 01h, 06h,
     AL = Number of input function          07h, or 08h
          to be invoked after resetting       AL = 8-bit input data
          buffer (must be 01h, 06h,
          07h, 08h, or 0Ah)                 If called with AL = 0Ah
                                              None
     If AL = 0Ah
       DS:DX = segment:offset of
               input buffer
                                    -♦-