Within this project, we developed alternative scientific firmware for the HP-20b and HP-30b business calculators. As part of this, a comprehensive mathematics library has been developed. Check out the subversion sources decn.{c,h} and complex.{c.h}
WP 34S turns said business calculators into powerful keystroke-programmable scientific instruments. There is a printed manual available for WP 34S v3.2. Look here: https://www.createspace.com/4106229.
WP 34S is field-proven since 2011. We succeeded in satisfying the most fastidious users - read about their experience at http://www.hpmuseum.org/forum.
Recently, we've updated WP 34S to v3.3. And we've derived an entry-level scientific calculator for the same platform: WP 31S. Spiral bound A5 manuals for both can be made available shortly but are put on hold until there are sufficient orders in advance to justify printing (please see http://www.hpmuseum.org/forum/showthread.php?tid=1120&pid=10065&mode=threaded).
