DOS / Functions / 0C

                     INT 21 - DOS - CLEAR KEYBOARD BUFFER

Input	DOS1	Y	DOS2	Y	DOS3	Y	DOS5	Y	Output
AX	0Ch		01,06,07,08,0A						AX
BX									BX
CX									CX
DX									DX
ES:DI									CF

Note:   Flushes all typeahead input, then executes function specified
        by AL (effectively moving it to  AH and repeating the  INT 21
        call).  If AL  contains a  value not  in the  list above, the
        keyboard buffer is flushed and no other action is taken.

See Also 01h 06h 07h 08h 0Ah