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WP 34S Scientific Calculator


Note: Because the HP 30b has been discontinued, I no longer have "perfect" units available. All 34S calculators that I am shipping now have noticeable keyboard issues, where multiple keys take more force in order to register. Unfortunately there is nothing I can do about this, as it is just an example of the poor quality control of HP's current offerings.

The WP 34S is the most powerful scientific (non-graphing) calculator on the market. It is not an HP product, but it is rather a community-created product based on an existing HP calculator platform. The software of the 34S was written largely by Walter Bonin and Paul Dale, initially just as a PC program. Later, Marcus von Cube joined the team and made it run on the HP 20b/30b platform.

At this point, the WP 34S functionality is comparable to that of the long-discontinued HP 42S, but expanded significantly.

I have written instructions explaining how to make your own WP34S, but if you would like the work done for you, this package provides you with a full WP 34S calculator, with the following components:

This means I carefully open the calculator, solder in the components, and then close the calculator, with no damage to the case. Then I carefully attach the overlay sticker. Finally, I flash the latest version 3.3 ROM (from SVN), using the crystal version to include the stopwatch.

Note: For international deliveries, I can ship it by First Class Mail, reducing the shipping fee to around US$25 (instead of $40+). However, there is no tracking available with this shipping method. Please email me for details.

Physical Characteristics

Technical Specifications

Calculating Environments





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Part of the HP Calculator Archive,
Copyright 1997-2015 Eric Rechlin.