How do I use the graph buffer? Or... What is it? Thanks Nat Sith smithrh@esper.com >Ipoint >Input. >B, C are the x-y coordinates in pixels. >D is set either to 0 light, 1 dark, 2 reverse, 3 test pixel, 4 >copy from display buffer. > >Output. >If D=3, Z is outputted as either 0 or 1 depending on whether the pixel is >set or not.