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An optical stimulator designed for vision research experiments is described. The stimuli sequences of light are given in matrix form and can be permuted at will to result in a highly versatile instrument. Background and stimuli lights are derived from a common source to minimize cost and errors from the light source instability. The stimulator is built around two 8080 microprocessors controlling 12 stepping motors, a seven track FM recorder, three optical shutters, and a video monitor for command and control purposes.