Int 4A Fn 01  - Ti Professional Pc - Keyboard - Get Keyboard Status        [b]

   AH = 01h

Return: ZF set if no keystroke available
   ZF clear if keystrokes in buffer
       AX = next keystroke (AH=00h for ASCII keys -- no scan code)

See Also: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=01h