INT 62 u - FGDRIVER v4.02 - "FG_KBLAST" - GET MOST RECENT SCANCODE PROCESSED
	AX = 0067h
Return: AX = scancode for keypress most recently processed by FastGraph's
	      low-level keyboard handler, or 0000h if no keys since FG_KBINIT
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=0066h,AX=0068h,AX=0069h