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Steve Russell Demonstrates Spacewar! on a PDP-1

At the Computer History Museum’s Revolution exhibit opening, Steve Russell demonstrated Spacewar! running on a PDP-1, with two ships battling under the pull of a virtual sun.
Length2 min Posted Quest giverVGSources Team
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In a 2011 video interview, Spacewar! creator Steve Russell demonstrated a working version of the early computer game on a Digital Equipment Corporation PDP-1 at the Computer History Museum in Mountain View, California. The demonstration, filmed around the opening of the museum’s Revolution exhibit, showed how a two-player space duel turned the machine’s display and processing limits into part of the game.

What was Spacewar!?

Spacewar! was an early computer game built around a duel between two spacecraft. In Dean Takahashi’s January 12, 2011 GamesBeat report, the ships are identified as the Needle and the Wedge. Players maneuvered around a sun whose gravity affected the ships, adding a demanding navigation problem to the fight.

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The missiles did not follow the sun’s gravity. The report says memory limits led the designers to omit that calculation; Russell described the weapons as photon torpedoes or pulses of light energy. That contrast captures a central feature of the game: its rules and action were shaped by what the computer could afford to calculate.

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How did Steve Russell demonstrate it?

At the Computer History Museum’s Revolution exhibit opening, Russell had a working version running on a PDP-1. The setting made the demonstration more than a look at old footage: visitors could see the game operating on the kind of computer for which it was made. The 2011 report presents the interview as a demonstration, not a complete transcript of Russell’s remarks.

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How much of the PDP-1 did the game use?

GamesBeat described Spacewar! as roughly 2,000 lines of machine language and said it used about half of the PDP-1’s 4,000 18-bit words. Those are approximate figures reported in the 2011 article, not independently audited measurements. They give a sense of the constraint: the game had to fit within a small memory budget while updating two moving ships, their weapons, and the effects of the sun.

Who contributed, and what influence did the game have?

The report places Russell’s work in the context of MIT’s Tech Model Railroad Club and says four people contributed to Spacewar!, but it does not name all four. It therefore does not support a definitive contributor list on its own. Takahashi’s account describes the game as helping spark interest in computer video games and names Computer Space, Space War, and Asteroids as later copycat games; that is the article’s historical framing, not an exhaustive account of the games’ development or influence.

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Where to watch the interview

Dean Takahashi’s GamesBeat report on Steve Russell demonstrating Spacewar! was published on January 12, 2011 and links to the video interview. The accompanying report supplies the gameplay and hardware context, but does not provide a full transcript.

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