Int 62 Fn 0063  u - Fgdriver V4.02 - "fg_intkey" - Get Keystroke, No Wait  [V]

   AX = 0063h
   ES:BX -> variable pointer record (see #3160)

Return: variables updated

Notes: the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145 at AX=0000h)
   If the keyboard buffer is empty, both the ASCII and extended keycodes
     are set to 00h

See Also: AX=000Ah,AX=0046h,AX=0069h,AX=00DEh,INT 16/AH=01h

Format of FGDRIVER INTKEY variable pointer record:
Offset Size    Description (Table 3160)
 00h   WORD    segment of BYTE buffer for ASCII keycode
 02h   WORD    offset of BYTE buffer for ASCII keycode
 04h   WORD    segment of BYTE buffer for extended keycode
 06h   WORD    offset of BYTE buffer for extended keycode