OXO was a computer game developed by Alexander S. Douglas in 1952 for the EDSAC computer, which simulates a game of Noughts and crosses, also sometimes called Tic-tac-toe. OXO is the earliest known game to display visuals on a video monitor. To play OXO, the player would enter input using a rotary telephone controller, and output was displayed on the computer's 35×16 dot matrix cathode ray tube. Each game was played against an artificially intelligent opponent.
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Well I played a game and lost. Utilised the Edsac Simulator, a nifty little bit of historical recreation I will say, but very much goes to show how this wasn't intended for the average member of the public to interact with. This was part of a very heavy thesis by a future computer science professor at Cambridge, utilising a device made four years after the end of World War II, and god does it feel like it.