INT 62 u - FGDRIVER v4.02 - "FG_WAITKEY" - FLUSH KEYBOARD BUFFER AND AWAIT KEY
	AX = 00DEh
Return: after next key pressed
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=000Ah,AX=0046h,AX=0063h,AX=0069h,INT 16/AH=00h