A two-handed game controller has a single dual analog/digital x-y directional pad mounted on the top which can perform either analog or digital functions. A mode switch on the controller allows an operator to select either analog or digital control settings. The controller also has a button grouping...http://www.google.de/patents/US5923317?utm_source=gb-gplus-sharePatent US5923317 - Two-handed controller for video games and simulations
