This invention relates to a video game system having a displaying software for displaying a key programming process. The video game system comprises a video display, a game cartridge, a game control unit having a program key and a plurality of control keys, and a game box. The game box comprises...http://www.google.de/patents/US5769719?utm_source=gb-gplus-sharePatent US5769719 - Video game system having means for displaying a key programming
