On a listserv of which I'm a member, Jerome McDonough points out that Tennis for Two is an analog game, so not only does it not require a computer, the medium itself -- an oscilloscope -- is an analog, so the information being represented on the screen isn't digital at all. An even earlier game, and the first game to use digital graphics, is Noughts and Crosses (1952).
This page lists the source code for the world[']s first computer game and incidentally the world[']s first computer based version of noughts and crosses (tic tac toe).This is the original source code written by A.S. Douglas that was loaded from a punched paper tape and run on the EDSAC machine. It is written in an assembler. even for those of us who are unfamiliar with the EDSAC instruction set and it's assembly language some parts of the code look reasonably comprehensible. The most impressive feature is it's length - this very short piece of code manages a good game of noughts and crosses.
Keen to find out more? Then download the EDSAC simulator and the documentation from www.dcs.warwick.ac.uk/~edsac/ You can then follow this algorithm or try your hand at programming the worlds first programmable computer.
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