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OXO was a computer game created by Alexander S. Douglas in 1952 for the Electronic Delay Storage Automatic Calculator (EDSAC) computer, which simulates a game of noughts and crosses, also called tic-tac-toe. It was one of the first games developed in the early history of video games. Douglas programmed the game as part of a thesis on human-computer interaction for the University of Cambridge. The EDSAC was was one of the first stored-program computers, with memory that could be read from or written to, and had three small cathode ray tube screens to display the state of the memory; Douglas ...