OXO played in an EDSAC emulator for System 6/System 7 running in Classic in Mac OS X v10.4.3.
Developer(s) A.S. Douglas Designer(s) A.S. Douglas Platform(s) EDSAC Release date(s) 1952 Genre(s) Traditional game and Paper and pencil game Mode(s) Single player Media/distribution Delay line memory
OXO was a computer game written for the EDSAC computer in 1952, an implementation of the game known as Noughts and Crosses in the UK, or tic-tac-toe in the United States. It was written by Alexander S. Douglas as an illustration for his Ph.D. thesis on human-computer interaction for the University of Cambridge. OXO was the first digital graphical game to run on a computer.
The simulation was played using a rotary telephone controller. OXO is often listed as the first computer game.
In OXO the player played against the computer, and output was displayed on the computer's 35×16 pixel cathode ray tube. The source code was short, yet it played a perfect game of noughts and crosses. OXO did not have widespread popularity because the EDSAC was a computer unique to Cambridge.
9 8 7 NOUGHTS AND CROSSES 6 5 4 BY 3 2 1 A S DOUGLAS, C.1952 LOADING PLEASE WAIT... EDSAC/USER FIRST (DIAL 0/1):
EDSAC/USER FIRST (DIAL 0/1):1 DIAL MOVE:6 DIAL MOVE:1 DIAL MOVE:2 DIAL MOVE:7 DIAL MOVE:9 DRAWN GAME... EDSAC/USER FIRST (DIAL 0/1):
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