This project has created scientific firmware for the HP-20b and HP-30b business calculators.

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.

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. Since 2014, WP 34S runs in version 3.3. Our customers confirm its documentation is excellent and comprehensive (see feedback); a full-color printed edition is available from https://www.amazon.com/dp/153366238X since 2018-10-15. Alternatively, you can get a personalized pdf-manual for a ≥ 9 US$ donation here.

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.amazon.com/dp/1499231164 .

Features

  • RPN - the most natural way of operating a calculator
  • Functionality of HP-42S, HP-16C, and HP-32II included*
  • Battery-fail-safe on-board backup
  • Bidirectional communication with your PC
  • Most ample set of statistical distributions implemented
  • Orthogonal polynomials (e.g. Hermite's, Legendre's) implemented - plus more advanced mathematics!
  • Firmware is maintained and can be updated easily
  • * except HP-42S data types (due to hardware limitations)
  • Free pdf manual in Chinese!
  • Find out what we are working on now: https://gitlab.com/rpncalculators/wp43

Project Samples

Project Activity

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License

GNU General Public License version 3.0 (GPLv3)

Follow WP 34s

WP 34s Web Site

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User Reviews

  • This is a wonderful project for those interested in high end scientific/engineering calculators. Any seasoned long-time user of HP's RPN is likely to enjoy the rich function set of the WP-34S, and the familiar programming model. Since it also includes the integer based functions from the 16C, it is a handy tool for programmers. The only downside to this project is the relatively poor quality of the HP-30B keyboard. One cannot expect to get many years of reliable use from these because of this. The hardware investment is very modest. I spent about 30 bucks on a new (NOS) HP 30B from eBay in 2019. A vinyl keyboard overlay is about 6. And I was able to flash the firmware with nothing more than an FTDI USB/TTY converter (3.3V) and some Dupont jumpers which I had on hand, but which can be had for about 5. A calculator that is more powerful than a 42S & a 16C combined for under 50 bucks is attractive, plus it's just fun to do the modding. Speaking of modding, there are several options one can add for increased functionality with just a few more parts, including RT clock, stopwatch, IR printing, and USB interface. Thanks to all the contributors who've made this available to the community!
  • Absolutely magnificent good work. A perfect calculator project. A briliant idea as well, to replace a half stupid hardware with a big brain transplantation. In this project I can smell the engineering art of HP in the late 70th to 80th. Delivered with a professional documentation, which seems to have the approach to be comprehensive, which is quite impossible in view of the wealth of functionality. And as far as I tried until now, there is no error, no single bug in the software!
  • Works with WINE on Linux!
  • A fantastic resource and powerful tool. With unprecedented accuracy, speed and feature set. The WP-34s extends the RPN model beyond my wildest imaginations while providing ease of use, excellent documentation and frequent updates. For the serious scientific handheld calculator user who preferes RPN, this stands far in advance of any alternative. That it is so inexpensive is just incredible. Well done, gentlemen! Jim Horn, HP RPN daily user since 1975
  • WP-34s: The HP calculator that HP could never build. The current "top of the line" HP scientific-programmable calculator is the HP-35s, which for reasons I won't get into here, is not as good as the calculators HP made during the 1970s and 1980s. With a switch back to in-house calculator development, HP made the HP-20b and HP-30b calculators so that you could flash your own firmware and turn it into whatever you wanted it to be. That's what Walter, Pauli and Marcus have done - borrowed a bit of code from the Open RPN project and with lots of new code, produced the WP-34s firmware which is basically an HP-42s + HP-16c plus a whole lot of new stuff never seen before in an HP calculator. You could get an HP-30b, flash it with the WP-34s frimware, apply a keyboard overlay from Eric, and happily use it as an HP-42s and do all the things you could do with that calculator, and not use half the functionality of the WP-34s. Programs can be written, tested and debugged using Neil's compiler and one of the Pascal's multi-platform emulators of the WP-34s, then transferred to the calculator via the serial cable. Maybe one day HP will build something to match the WP-34s, but for now, it's the greatest HP programmable scientific / computer science calculator ever made!
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Additional Project Details

Intended Audience

Information Technology, Science/Research, Education, Manufacturing, Engineering, Automotive

Programming Language

C

Related Categories

C Scientific Engineering, C Embedded Systems Software, C Calculators, C Scientific Calculators, C RPN Calculators

Registered

2011-01-02