Abstract: The present system includes an optical reflective sensor, which is hand held and moved over a color density scaled grid, such as a gray scale grid, to produce analog signals which, when processed, become the basis for the direction of movement of a screen cursor. The analog signals are converted into binary coded signals and further into hexadecimal signals. Each hexadecimal signal is transmitted to eight AND gates whose other inputs represent a (gray scaled) value of a position from where the sensor could have been moved. Accordingly only one AND gate will produce an output signal and that output signal will only be produced if the move is a valid, or acceptable, move. If the sensor has been validly moved, the output signal of the selected AND gate will be interpreted (circuit-wise) to represent one of the directions of a compass. The output signal will be used to change the state of a bit map memory to thus move the screen cursor. Hence the screen cursor will follow the sensor.