Int 21 Fn 0C  - DOS 1+ - Flush Buffer And Read Standard Input              [D]

   AH = 0Ch
   AL = STDIN input function to execute after flushing buffer
   other registers as appropriate for the input function

Return: as appropriate for the specified input function

Note:  if AL is not one of 01h,06h,07h,08h, or 0Ah, the buffer is flushed but
     no input is attempted

See Also: AH=01h,AH=06h"INPUT",AH=07h,AH=08h,AH=0Ah