tiple touches on a resistive touch screen, FIG. 4a is a schematic diagram showing the top and bottom edge conductors, FIG. 4b is a schematic diagram showing the left and right edge conductors, and FIG. 4c is a circuit diagram showing an electrical circuit equivalent to the resistive touch screen when there are two touches on the screen; [0017]FIG. 5 is a schematic diagram of a circuit that permits