Int 18 Fn 04  - Nec Pc-9800 Series - Keyboard - Key Pressed                [J]

   AH = 04h
   ???

Return: ???

Note:  details are not available at this time

See Also: AH=00h,AH=02h,INT 16/AH=00h,INT 16/AH=01h,INT 16/AH=02h