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Please note that due to serious flooding in my hometown of Houston, I am a bit behind on fulfilling orders. Thank you for your patience as we recover. Also, due to issues with making overlays, no WP-34 or WP-31 related items will ship before mid to late October.

WP 34S Scientific Calculator

Back ordered until Oct 31.

Note: Because the HP 30b has been discontinued, I no longer have "perfect" units available. All 34S calculators that I am shipping now have a minor keyboard issue, where one or two of the keys takes more force to press than the others. If you are really picky it may be an issue, otherwise it is no worse than the other, less-than-perfect modern HP calculators, as this exemplifies 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





More Photos

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