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This is my entry to Retrochallenge 2016/10, a program for the early 1960s DEC PDP-1 computer to run a simulation of "Computer Space", the first coin operated arcade video game of the early 1970s. In order to disable hardware acceleration, choose (in Chrome): Settings → Advanced → System → Hardware acceleration → disable + restart the browser.

If you experience any problems, you may want to try a non-Chromium browser like Apple Safari or Mozilla Firefox instead.Īpparently, the problem is related to (faulty) hardware acceleration in Google Chrome.

(Updated ) Google Chrome may have issues running the emulation smoothly, rather grinding along at single-digit frame rates. An additional splash-screen renders original character definitions from 1964.įor further information on the PDP-1, its Type 30 CRT Display and the emulation see Note on Browsers (Chrome) Some importance was put in the recreation of the appearance of the original CRT display and the unique experience conveyed by it. Further, cycle counts were added for accurate timing and frame rates. Especially the shift/rotate instructions and the arithmetics were rewritten and now include an emulation of the automatic hardware multiply/divide option. The emulation was substantially extended to support additional instructions and auxilary hardware.

The emulator is based on code by Barry Silverman, Brian Silverman, and Vadim Gerasimov. PDP-1 emulation by Norbert Landsteiner, 2012–2016. The program simulating it on the PDP-1 is new code from 2016. The original arcade game Computer Space by Nolan Bushnell and Ted Dabney (Syzygy Engineering) / Nutting Associates, 1971. The PDP-1 emulation has been originally conceived for running Spacewar!, the first known video game for a digital computer, but is here repurposed to run a simulation of the arcade game that Spacewar! inspired. This is a virtual DEC PDP-1 emulated in HTML5/JavaScript running a simulation of "Computer Space", the earliest known arcade video game. Outscore the saucers for ex­tend­ed play in hyper­space.

Evade the saucers' missiles and use yours to score hits. There is no gravity in space, rocket speed can only be changed by thrust. Insert quarter and press start your rocket ship will appear.