Calculator blog

Musings and comments about our common interest


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hp30b and wp34s - disappearing?


photo_2I have very few units of HP30b left - anyone interested in the wp34s needs to act quickly - or we will exhaust our stocks.

I are finding increasing problems in sourcing HP30b. Despite being a good calculator, its external aspect never won a lot of friends and it is not part of the EAME HP calculator offer anymore. In fact, I can’t find it except in very strange language combinations - which is not relevant for wp34s conversions.

If you are not aware of what a wp34s is, please read here for a description. It is by far the most complete scientific, non-graphical calculator ever designed. Taking profit of the software development kit (SDK for short) made available by HP, Bonin, Dale and Von Cube, helped by the testing and feature suggestions of the best and more experienced HP calculator users, created the most advanced and fastest calculator ever. All imaginable constants - you have them. All imaginable probability distribution functions - are there. The most obscure mathematical functions - there too. Do you feel limited by a 4-level stack? Get 8 instead. Are you accustomed to use the 4th level replication feature, and you want to keep it? you can set it of 4-level stack too.

Eric Rochlin created overlays of very good quality, that, once applied to the calculator, create a professional product that you can take with you to work.

There is also a fully fledged, free version for smartphone - at least I have it on my iPhone and iPad. I think that it is an excellent way of getting in touch with it. You can search in the respective app shops for wp34s and you will find it. Install it!

You can download the manual from our website page too.

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Más sobre: hp30b, wp 34s
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New version of wp34s: 3.3

photo_2The wp34 has just received a new upgrade. It goes now from 3.3 version to 3.4. As I did no follow it too closely, I don't know the improvements to this version. It uses the same key scheme as the previous one, so the only thing that you need to do is to upgrade the software again.

For those of you that don't have an interface cable, don't worry: our shop can upgrade your calculator for 12 € per unit, plus shipping costs. Just email us at and we’ll organize it.

We can also upgrade from version 2 machines, but in this case it needs to be necessarily more expensive, since the keys are different and you need a new key set. (There is an additional problem in removing the previous one - I have not managed to do it properly on mine, so I cannot vouch for aesthetic perfection.)

For those that want a RPN scientific calculator, there is nothing better under the sun, short of an HP 41cl (and yet, the wp34s is much faster and has a much bigger feature set at your fingertips). The double accuracy capabilities are unmatched for a calculator; and the constant set makes it excellent for any lab work. The hp prime is more nice to show to others, it can help you with algebraic maneuvering and is much better to use if you're a student; but when it comes to raw computing power, there is no substitute for the wp34s.

It is surprising that development is ever continuing, given that the designers are head on into a different, much more ambitious project, namely the wp43s, a calculator from scratch. We will inform you about that too.

(Meanwhile, Monte seems to be breadboarding a solution to bring the Time Module to the 41CL system. Let's see where it ends!)

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wp34s - last donors

I have been asked whether the HP30b and 20b are discontinued. While there are still lots of units in the distribution channel, the decision to discontinue them was taken long before. Nevertheless, I am ordering my last stock to be able to respond to wp34s orders – which do not seem to diminish.

The HP20b is the turkey in the financial roster of HP. The HP10bII+ has much better keyboard, a very comprehensive function set, and a good quality feeling. It feels an HP all the way – despite not having RPN entry mode. I have used HP20bs, but I have never stocked them or opened one for myself. If you’re accustomed at any rate to HP calculators, you need to forget that model.

Later models from HP, even being copies from other brands (as the case may have been) have made an effort to get a decent keyboard. The HP30b has exactly the same innards and shares most of the programming, BUT has a decent keyboard. While using a number of the newer calculations, I have learned to like the low profile, low-movement, click-and-rotate keys. These are used, in a way or another, up to the HP Prime. It will never be taken for a HP41 (probably the heyday of HP keyboard quality) or Pioneer or HP48 family keyboards (second best in my opinion, but still very responsive and giving good feedback.

If I was buying a new financial calculator, I would try by all means to stretch to the best there is, i.e. the HP 17bII+. You get a much better calculator from (nearly) all angles. The keyboard quality is better; the 2 line dot-matrix screen, miles ahead of the mid dot matrix, mid numerical screen of the HP30b. The only area where the HP30b show a clear pair of heels to the HP17bII+ is on speed and by having several specific functions that the HP17bII+ does not have, including Black and Scholes and several statistical functions not found elsewhere.

But if I want the best current scientific calculator, I now have 2 options: the HP41CL and the wp34s, which is built around the HP30b. In many cases, the HP41LC will be beyond your reach – for the time being. I still think it has to be the aim to aspire for any devoted calculator aficionado. It is my preferred day-to-day calculator and it is always on my work desk. But I understand that its price of close to 600 € may prevent some of us from stepping in and get one. Or incur in the alternative risk of doing it yourself. (which is a simpler task that it may seem at first sight)

If you have not been into calculators for the past couple of years, I will explain (again) what a wp34s calculator is. There has been an open project to repurpose an HP calculator (in this case the HP30b, but there have been essays with other machines like the HP12c (Atmel-based version)), including the best available software and using the processor memory up to the top, including ll kind of mathematical operations and constants. The output of this project, led by Walter Bonin and Paul Dale (at the beginning), later joined by. The software passed through many iterations, probably several thousands (I stopped at more than 3k), and it improved substantially. Some aficionados even made several hardware modifications, to allow for USB interfaces, infrared printing, etc. The original machine was conceived as an open platform that happened to be very modifiable. Many firmware modifications were made in order to increase code compactness and thus add more functions. If you want to take a look at the complete set of features, you may download the latest manual from this site – and be surprised by the wealth of capabilities: many statistical distributions, in three forms (direct, inverse and cumulated); complex number calculation; your choice of a 8-line stack or 4 stack; all kind of mathematical functions (Bessels, etc. Too many to be described in a blog post), and up to 34 digits of accuracy in double precision. The ideal mathematical machine!

Well: all this drivel to just say that the stock of HP30b has just arrived – and we can prepare as many wp34s as you may need!


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The WP 34s is back!

The wp34s is back!

Finally we received the overlays of the current approved design and we are ready to update the firmware of brand new HP30b s into the most powerful RPN calculator ever - with permision from the mighty HP42s

Eric's newer overlays are better than the previous, initial batch. You can choose between coloured shift keys or white; and you can choose as well between both division signs: / and the two dots with a dash in the middle. All are in the overlay for you, the user to choose.


There has been significant evolution since we updated the first calculators - now you can do matrix operations with them as well. 


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WP 34s just born


I received this week the overlays from Eric Rechlin. Wonderful quality and choice of material. You cannot touch it from where you are - believe me that feeling is good and adherence superb:


I have received several overlays. I plan to set the complete kit: the flashed HP30b + the overlays. Just to Europe to avoid competition with Eric; and 10 € of each sale will be donated to the wp34s project.


Now, let's see the machine under surgery:


It was updated with the latest available build, 1125 at the time:



Now, let's see how it ended up:


Sorry - the light condition was low and my pulse unstable -> fuzzy picture.

This one is better:

When you do it, do not try to fix it with a hard thing - see the mark over the CLx key.

I learned from it and the rest of the keyboard was excellent!!

It really looks professional, and the key feel is much better than the HP20b.

Now, let's try to work with it and make some programs !!!

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