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Re:Show HN: Spacewar! featuring the original "Minskytron Hyp... by fjarlq on Wednesday June 04, 2014 @04:36AM (#7844597)
The Origin of Spacewar, by J. M. Graetz:

http://www.wheels.org/spacewar/creative/SpacewarOrigin.html

Re:Show HN: Spacewar! featuring the original "Minskytron Hyp... by masswerk on Wednesday June 04, 2014 @04:52AM (#7844635)
See also http://www.masswerk.at/spacewar/SpacewarOrigin.html (corrected and annotated version, including additional interviews and images).

Some of my own analysis: http://www.masswerk.at/spacewar/inside/