This project has created scientific firmware for the HP-20b and HP-30b business calculators.
The WP 34S turns either of these business calculators into a powerful keystroke programmable scientific device.
The WP 34S has been alive and stable since 2011. We have succeeded in satisfying the most picky users - read about their experiences on the http://www.hpmuseum.org/forum.
In 2014, we've updated the WP 34S to version 3.3. The documentation for the WP 34S is excellent and comprehensive (see customer feedback); a print version is available from: https://www.createspace.com/5304580
We have also produced produced the WP 31S which is derived from the WP 34S source code. This is an entry-level scientific calculator. The printed manual for this calculator is available from: https://www.createspace.com/4773370
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