This project has created scientific firmware for the HP-20b and HP-30b business calculators.
The WP 34S turns either of these calculators into a powerful keystroke programmable scientific device. According to our customers, it's the most powerful and fastest RPN scientific pocket calculator ever built.
The WP 34S is alive and stable since 2011. We have succeeded in satisfying the most picky users - read about their experiences on http://www.hpmuseum.org/forum/forum-8.html. Find the Owner's Manual v3.2 at https://www.createspace.com/4106229
In 2014, we've updated the WP 34S to version 3.3. Our customers confirm its documentation is excellent and comprehensive (see feedback); an updated printed edition is available from https://www.createspace.com/6329314 since June 2016.
We have also produced the WP 31S which is derived from the WP 34S source code. This is an entry-level scientific calculator. Its printed manual is available from https://www.createspace.com/4773370
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