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Adv550, version September 18, 1984

This is Adv550 built from Dave Platt's
Honeywell A-code source dated
September 18, 1984.

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Unlike other implementations of adv550, this version is build from unmodified Platt's Honeywell A-code source and preserves all text formatting features of the original. Reconstructed sources of Platt's original A-code system are also available at

Play it now

You can play Adv550 right now, either on a cloud server or, if you are using a robust modern browser, on your local machine (1.8 MB).
The local version works well with up-to-date Firefox, Chrome, Safari and MS Edge, though other browsers may not cope and some ad- and popup-blockers block it for some reason. It runs strictly locally, with no further network access – games are saved in your browser's local storage space. You can save the page locally too, and later just point the same browser at the saved html file to continue playing.

Pre-built versions


Game sources

All A-code sources, including sources of Adv550 (both A-code and derived C), and A-code documentation are available in the gzipped tarball acode-12.75.tgz (1.1 MB) – please see a separate page for a description of its contents.

To the Adventure downloads page
To the Mipmip home page
Feel free to leave a comment!
Mike Arnautov (27 January 2019)