Int 16 Fn 10  - Keyboard - Get Enhanced Keystroke (enhanced Kbd Support O  [B]

   AH = 10h

Return: AH = BIOS scan code
   AL = ASCII character

Notes: if no keystroke is available, this function waits until one is placed
     in the keyboard buffer
   the BIOS scan code is usually, but not always, the same as the hardware
     scan code processed by INT 09.  It is the same for ASCII keystrokes
     and most unshifted special keys (F-keys, arrow keys, etc.), but
     differs for shifted special keys.
   unlike AH=00h, this function does not discard extended keystrokes
   INT 16/AH=09h can be used to determine whether this function is
     supported, but only on later model PS/2s

See Also: AH=00h,AH=09h,AH=11h,AH=20h