Ralph H. Baer was the inventor of the first home video game system, which was licensed to Magnavox and sold as the Odyssey. Baer developed the machine as a side project while working at Sanders Associates, a defense contractor. In early 1978, Sanders began to explore the development of games for the soon-to-be-released Odyssey² console. Their first and only O2 project was a programmable pinball game designed by Baer and programmed by Don McGuiness. Unfortunately, it was never completed and the sole prototype sat forgotten in Baer's basement until 2000, when a limited run of Pinball cartridges was produced and sold at Classic Gaming Expo, July 29-30, 2000. Thirty copies of the game, each personally autographed by Baer at the show, were sold for $25 each.