Leibson's Law

Leibson's Law: It takes 10 years for any disruptive technology to become pervasive in the design community. This blog is about the disruptive technologies that either have or will win over electronic engineers, some that won't, and why. Written by Steve Leibson, Tensilica's Technology Evangelist. See my history site at www.hp9825.com.

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Wednesday, July 4, 2007

HP 35s: Hewlett-Packard Resurrects and Improves a Super Scientific Calculator

My first pocket scientific calculator was the first scientific pocket calculator, the HP 35. I previously wrote about some premature information on the 35^th anniversary HP 35s. Now it’s real and you can get it soon for $59.95. You’ll find information on the new calculator at http://www.calculators-hp.com/35s.html. For some amusing discussion of the product, look here. You may not be one of the holdovers who still uses a pocket calculator for serious computations, but you still might want to own this (small) piece of history.

The new HP 35s pocket scientific calculator

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at 7/7/2007 4:28:19 AM, Matt said:
Beautiful.

at 7/15/2007 4:49:07 PM, John said:
Note the big lovely enter bar. Sold.

at 7/27/2007 11:00:47 AM, Surprise Surprise! said:
I never thought anything could top my old 11c but this sure comes close. Many things are actually simpler and easier! What? My favorite improvement is that you can use the calculator while it is still in the case. This may not sound like much but I really like it. It keeps you from misplacing the case (something I do all the time) and it protects the back of the case from scratches. I have a near mint 12c (1987) and the only blemish is a small scratch on the back. The display is almost as good as the 11c and a vast improvement over the 33s. You can now see the decimal point without a magnifying class. The same is true for the keyboard layout. Clean and neat just like the 11c and WAY better the that confused mess that is the 33s. I never thought I would say this but the programming is better than the 11c. SHOCK! The best thing is the way the program lines are displayed. It shows the line and the program that it is associated with instead of just number, 001 in the 11c. The 35s shows A001 indicating that this line is associated with program A. I like it! Another program improvement is the way the function is displayed. It shows what the functions is, like X for times instead of the key location 20 (line 2, key 10) as in the 11c. This a big help in debugging a program. Almost as useful is the up and down caret key to move through a program. The only really dysfunctional item is the orientation of the yellow and blue arrow keys. They refer to the keyboard layout of the 33s. Doh! They should be: LEFT to RIGHT up for the yellow key and left to right DOWN! for the blue key. Maybe they will fix this on latter production runs and I will have a rarity. Ya, right. All in all I really like this machine. It may finally be time to retire the 11c and 15c to the display case. Looks like they have been replaced.

at 7/27/2007 11:10:24 AM, Steve Leibson said:
Wow! Thanks for the mini review. Anyone else?

at 7/27/2007 12:50:27 PM, Eric said:
This is the best calculator to come out of HP for years. It reminds me of my old HP-15c, which I sold long ago when I was a starving grad student. The keys have the same feel I recall from the HP-15c. Plus, it is really a calculator rather than a squeezed down (and not too useful in my opinion) version of Mathematica found in the graphical series of products.

at 8/2/2007 9:02:26 AM, Jedi said:
And now HP is recalling them to correct a design flaw!

at 8/2/2007 11:22:05 AM, Steve Leibson said:
Thanks for the tip, Jedi. I'll blog it separately.

at 8/9/2007 2:33:14 PM, Jeff Pynnonen said:
The return to a clean, classic look for the latest HP calculator. This is an awesome calculator. I ordered mine from the HP SMB online store and got it quickly. I am pleased with the calculator, the manual, and HP's service. I hope they follow the looks in the next iteration of the HP 50g. I would buy the next iteration of the HP 50 if the only change was to this same look and style.

at 8/11/2007 1:39:44 AM, John said:
The HP 35s looks terrific! But it looks more like the HP 41C than it does the HP 35.

at 8/20/2007 9:53:31 AM, Gene said:
I still have a working HP 35, with case and charger. The batteries are long dead, but it runs fine on the charger. Many years back when the HP 65 was introduced, we accidentally left it exposed to a large radiation source for about 10 seconds. Every LED and decimal point was lit when we turned it on after the exposure. HP wanted it to evaluate the effects of the radiation. HP replaced it with a new one and we were much more careful with the replacement.

at 8/28/2007 3:59:41 PM, DavidPL said:
It looks great, but these days, I would want a usb connection to a PC with the minimum functionally of backing up and restoring programs. A program on the pc function would be nice for serious work.

at 9/2/2007 5:54:24 PM, JS said:
Very similar to the HP-20S, but RPN with 2 line display. Does complex numbers and vectors. Doesn't do differentiation. Does do numerical integration. Does Hexadecimal, Octal and Binary bases, and limited binary operations (boolean only, no shifts/rotates). Solver. I'll keep my HP-28C (more powerful, but bulkier and slower to use), but I'll probably retire the 20S.

at 9/10/2007 9:16:53 AM, Gatorjon said:
Unfortunately, I've been quite disappointed with the 35s. Within a few days, the faceplate popped up around the display and this unit was purchased after the recall! In my opinion, another cheap piece of crap from China! Perhaps I should test it for lead!!!

at 9/12/2007 7:29:24 PM, Mike Gomez said:
I'm looking for a calculator that programs like the no longer made HP42s. Is the Hp 35s the one? Can someone let me know. mgomezcivil@hotmail.com

at 10/6/2007 4:55:57 AM, Gerard Manvussa said:
A great calculator : beautiful design, more than 800 memories; just left and rigth arrows on blue and yellow keys : is it really usefull ? may be HP will fix that for the next (and soon) issue.

at 10/17/2007 5:21:49 PM, Arthur Dybevik said:
35 s looks great. looks similar to my 1981 model 34C. (still running OK) Have later used 11C, 42S, 48GX and 49G. My favorite is still the 42S. I think I have to buy the 35S. I am still waiting for a re-launche of the 42S; please HP. One quart of the LCD of my 42S is not showing anything. Possible to fix??

at 11/13/2007 12:15:18 PM, CVIII said:
I just started looking at the 35s, hoping for a 42s replacement. I bought the 33s but was highly disappointed. $400+ on Ebay is not an option. The 35s keyboard LOOKS promising but I am hesitant about blowing $60 as my $50 mistake (33s) is still staring at me. It was really more like $80 because I bought a lot of programming instructions from third parties. In the meantime, try www.fixthatcalc.com I tried it and was satisfied with the results. BTW, I'm still using my 42s as I haven't found a reasonable replacement.

at 11/14/2007 12:42:58 PM, CVIII said:
Mike Gomez (above) says he got one but was disappointed with the results. It is NOT a viable replacement for the 42s. That's all I needed to know. Thanks to MG for saving me $60 and a ton of aggravation.

at 11/15/2007 10:23:48 AM, srone said:
I was seriously considering a 35S, but after reading some of the comments, I think that I will keep using my 42S. They do look similar and most of the keys are in similar positions, but I don't want to spend $60 on a cheap HP labeled Chinese Calculator. I would prefer to spend $100 or more on a solid reliable calculator. Maybe HP can get the problems fixed and then I might spring for one. I have been using HP calcs since my 1st in 1975, a HP25, then a 41cv, and a 42s and last a 48sx. If I'm careful, maybe the 42 and 48 will last until I retire.

at 12/1/2007 9:46:31 AM, Jon C said:
I use a 41cv but it died. So I got a the new HP35S. I use about 5 programs which I assign to the top row of keys. I have one that converts a decimal number into FT Inches & sixteenth and one to do the reverse, a weight calculation formula and a simple multiplier key. Anyway the Hp 35s doesn't appear to a way to assign keys which makes it useless to me. Is there a way to assign shortcut keys to run more than one program with one key stroke like the 41CV?

at 1/10/2008 2:00:37 PM, Jim B said:
The batteries in my 42S died long ago. I started life with a $495 HP45. $100 for the polar to rectangular key was well worth it. I might buy one of these just to encourage HP to keep it up instead of giving in to the equal key. I have long believed that if kids used a simple RPN calculator at school they would never have trouble with algebra. They would learn the order of operations and how to think the problem through like a game. Typing an equation in and pressing = teaches them nothing.

at 1/28/2008 6:13:53 AM, deivid said:
If you own a 42s, there is no reason to buy this one. The 35s looks great, and is better built than recent hp models, but beware: - the keyboard has a nice feel, but does not equal the key touch of good old times. - there are *obvious* flaws in design and software that should have been corrected before production, to wit: - no builtin way to split Re and Im part of a complex number (this is a GLARING failure). - complex arithmetic is slightly better than with 32sii, with the same flaws (i.e., some functions allowed, some other not). Overall, this makes this complex support quite defective and little usable. - vector support is simply ridiculous. Again no way to split a vector nor doing something useful with it - major design failures: STO is a shifted key, as are exp, log, 10^x, ln. - Bugs of hp 33s (of which this calculator is a better-quality-build rehash) stay here (e.g. cosine bug). Don''t get me wrong, this is a very good calculator that makes for a much better 33s adding some of the good things of older models (32sII, essentially), but to compare *decently* to models 10 years old or more this would need a major face lift.

at 1/31/2008 10:22:18 AM, Richard B said:
I'll keep using the HP65 I have on my desk.

at 2/11/2008 8:38:53 AM, Tim G said:
I've got a 41C that I carry everyday. It's a download in my palm pilot. Too bad it doesn't support synthetic programming.

at 2/22/2008 3:43:34 PM, KI6ASP said:
I have two HP41cxs (non-virtual), and a HP25. For the 41s, I have the CMT HPIL digital meter, HPIL link and the HPIL floppy disk drive. Still use them at work. Will never part with them. Tom A.

at 2/27/2008 6:18:54 AM, Carlos Barberis said:
Don’t waste your money!!!! It is a shame that HP has released such a ergonomically poor design, although the calculator has the look and feel of the older classic calculators; that is about the only thing you get for your money. The functionality of this calculator can be described as confusing and very poorly thought out, it is hard to believe that HP has released this model with its present flaws. As an example; simple things like numerical base conversions which should be a straight forward function using a few key strokes, will leave you wondering. However, when you try such conversion in this calculator it will leave you scratching your head for an answer and don’t bother looking for the answer in the user’s manual, because the so called “user’s manual” has very little information about anything and it is pretty much useless.

at 6/5/2008 2:36:36 PM, JB said:
Looks similar to the old units from this once great manufacturer. Feels a bit like the old units as well. Very robust case comparable to the so called classics (35 to 67 models) and the 10c series from the eighties. Functionality is sufficient although complex number support could be better. Also, the vector arithmetic is limited to dimensions d<4 and therefore rather poor. The keys have the classical "HP-click" but still they feel somewhat mush due to the fact that they not only bend along their "x-axis" upon pressing (as intended) but also along the "y-axis" giving a somewhat insecure feeling typical for TI''s from the 1980''s (HP/Kinpo: fix this issue! (along with the (minor) bugs reported for this machine)). Overall speaking still one of the best "scientifics" out there on the market presently but one has to realize that quality has become a scarce commodity on that market nowadays.

at 6/28/2008 7:43:32 PM, Francisco Chavez said:
It may sound strange that a calculator can be bought based on its looks but there is certainly beauty in this device and is one of its strong points. It looks and feels like a professional tool. I have been working with it for a few weeks now and have a few comments about its programming capabilities. Before jumping to programming I like to say that the built-in Integrate and Solve functions are excellent. It can numerically solve and integrate fairly complicated equations with great precision. This is a great feature that adds a lot of power. You can use it for instance to work Time Value of Money calculations with ease. First the good parts. The programming is robust and versatile enough. I have implemented some fairly complicated calculations such as sunrise/sunset times for a particular date or dew/bubble point for a binary mixture. For the bad side I would say that having a relatively large memory, 32K, it is a pitty that there is no prevision for interaction with a PC. You can write a lot of lines in 32 K and you will have to enter it all on its keyboard. Another important limitation is that variables can only be named using one letter ("A", "B", etc). There is a way of using 800 variables through indirect reference, so the number of the variables is not the limitation but the inability to name them other than with one letter. For somewhat complicated programs it becomes very difficult to follow track. But, all in all, I think this is an excellent device for its price tag and very happy with the price/capabilities ratio.

at 7/11/2008 7:14:42 AM, Damien Mattei said:
a very good calculator, the look and feel is near hp15c or hp41c, two calculator i used at school, a very good calculator, and a good replacement to 15 years old hp48gx that had keyboard problems,hop hp will launch an hp50g replacement of the same quality one day.

at 7/11/2008 10:35:55 PM, Harry Smith said:
I love the llok and feel of this calculator. It has the Classic Look of a professional tool yet is reasonable priced. My only beef is that mine did not come with a printed manual although the (brief) quick start guide says a free printed version is available from 1-800-HP-INVENT. I haven''t ordered it yet. I really wish HP would buck this growing trend of NOT providing full manuals except on CDROM. In any case I found the operation to be surprisingly robust. While anyone can quibble about the key layout that is just a matter of personal preference - can''t satisfy everyone! Keep in mind that this is NOT intended to be a replacbment for the 41 or 42 series. Those days are gone for now. I am quite happy with tis model for what it does. I, too, was VERY disappointed with the 33S. I hope whoever designed that keyboard was summarily fired!

at 8/10/2008 6:54:21 PM, Frank said:
I've owned numerous HP models over the years starting with the 42e which took me to the state UIL calculator competition twice in the 80's. The 10c and 41CX got me through college. I later bought a 32sII and thought I was in heaven. After years of not needing a scientific calculator I sold my 32sII. I recently had to take the FE exam and needed a solid HP calculator for the exam, but found out the only HP models alowed are the 33s and the 35s. I bought both to try them. I agree that the designer of the 33s should have been fired or shot - it is a disgrace to the name. The 35s is another story. After using it to pass the FE, I came across a 32sII and much to my suprise, I prefer the keyboard and layout of the 35s. The buttons are larger and more spaced out than the 32s. I wish HP still made a unit with the operators on the left like the old 32e, but short of that I think the 35s comes close to being perfect. I've since bought a second 35s as a backup, because if history proves me right, HP will probably discontinue this one and replace it with an inferior model or possibly do away with RPN altogher. I hope not. I do wish HP would make another "c" type calculator like the 10c or the 11c. The keyboard layout of those was great and it fit into a shirt pocket so nicely.

at 8/17/2008 9:27:04 PM, Richard said:
The designer of the 33s should have been tortured first then shot...It is interesting that HP are still trying to sell that piece of s.h.i.t. I was constantly hitting wrong buttons and the action on the buttons were terrible. I had no confidence in the calculator The 35s is a much better calculator. I have confidence in the results. God I still wish they would come out with a new HP 15C

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Wednesday, July 4, 2007

HP 35s: Hewlett-Packard Resurrects and Improves a Super Scientific Calculator

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