The first computer game, Steve Russell’s “Space War,” is now 40 years old. These and other futuristic relics are about to go on display at a London gallery, billed as the largest collection of videogame memorabilia ever assembled.

The show is every player’s dream. View more than 250 separate exhibits, including hard-to-find vintage titles. In a wonderful coup, organizers nabbed one of only 10 or so known working DEC PDP-1 minicomputers, which runs Steve Russell’s legendary Space War!