INT 10 - VIDEO - Hercules GRAFIX - "LEVEL" - SELECT DRAWING FUNCTION
	AH = 44h
	AL = drawing function
	    00h clear pixels
	    01h set pixels
	    02h invert pixels
Return: nothing
Desc:	specify how graphics output will change the display
SeeAlso: AH=40h,AH=45h,AH=46h,AH=4Bh,AH=4Ch,AH=4Dh