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Welcome to the HP Calculator Wiki!

This wiki was originally created to be a development home for repurposing the HP-20b calculator, but has since grown to support several repurposing projects. It is our hope that this grass-roots approach to calculator hacking will expand to include other many HP calculator models and open-source projects. We have configured this wiki so that it supports all HP calculators and projects, and any and all new projects are welcome. If you know of other repurpose-capable calculators or calculator hacking information that could be interesting to our audience, please add to the wiki.

Everyone is free to read and partake of the information here. Registered users will be able to edit, contribute and participate in all facets of this site. Registration is free, and takes only a few minutes 1). If you have any suggestions on how to improve this site, please contact me and let me know what you think.


Bruce Bergman, Administrator

New HP Calculators

HP Prime Information

User-Contributed Program Libraries (UCPL)

Most Recent Projects

WP 43S Project

WP 34S (HP-20b/HP-30b) Repurposing Project

41CL (replacement CPU board for HP-41 owners)

HP-20b Repurposing Project

Repurpose-capable Hewlett-Packard calculators

HP-15c Limited Edition Scientific Calculator

HP-30b Professional Financial Calculator

HP-20b Financial Calculator

HP-12c (new ARM variant) Repurposing Information

Resources and discussion forums

Browse the wiki

See Sitemap or press Alt+X2)
Highly recommended since a lot of useful pages are not directly reachable.

What's New?

Automatic list of recent changes

For the activation of “edit permissions” maybe a day will pass.
On windows