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Calculator blog


Musings and comments about our common interest

 

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Shady Calculator Stories

Some sad stories in Ebay.

As many of you, I have been purchasing items in Ebay for both my own collection and for the shop. Most of the times you get good material - never a bargain, but what it is advertised. Then you find some guys that are quite liberal with adjectives - in particular, “working condition” and “good shape”. But in most cases they try to help.

But then you have a third type: those that give you a crappy product and then play with you. The aim is to dance with you until the 45 days period since the purchase has elapsed. A recent case comes to my mind. I bought an HP41c calculator sold as working. It took some time to arrive, in a plastic envelope, without any protection, dirty, battered, and, of course, not working. I paid for it “working” price, and it was in such a poor state that I did not venture into repairing it - I could have not sold it in such a state. I arranged the return of the calculator, which took some other days, since the delivery address was wrong, and then wait…and wait… and wait for the refund. “Do you want it in your account or in Paypal” “if in Paypal, then I need to put funds in it”. And then silence… the 45 days had elapsed.

Just in case you find him: the name is Pablo Alvarez Llinas, and his Ebay user name is beaviisb. In today’s world, anonymity is impossible. In linked he appears as working for HP Delivery Services.

I have another case, concerning an HP85 - but that’ll be the object of another installment of “shady calculator stories”

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Calculators for the Iphone 5

i41cx review

My former telephone died and my wife got me an iPhone 5. Then I set to get some calculators to work with in the system. In particular, I downloaded all the free ones. Here's what I got:

I did not load the HP15c in any of its versions, since i always carry one with me. I find that it is the finest device ever made for personal calculations, only rivaled by the mighty HP42s - but this is a completely different discussion...
I took the free version of the HP42s, Free42. It is built for the smaller screen of the previous iPhone versions


I got RPN25 calc. When you need a simple, RPN calculator, this is a nice alternative, since there are not too many keys and it has the basic set of functions. Also for smaller screens, but it is a pleasure to use.


I got a very simple RPN calc, iRPN Calc, which is as simple a calculator as you may find anywhere, with a very nice twist: you can change the items in the stack by moving them around with your fingers. Also for smaller screen.

 

I48. not built for the iPhone 5 - there is a wide white band in the lower part of the screen - it is in need of an adaption or at least a recompiling, in order to be livable with in the iPhone 5.


PowerOne SL: does not try to mimic the original HP calculators, and it is the first one that does fill the whole screen. It opens as an algebraic model, but when going to the settings page, you can change it into RPN. It has several pages for different functions, from numbers, angle functions, other transcendental functions, and memory registers. This is a fine addition to the screen.

 

The i41CX+

One of the calculators that has marked my scientific life was the HP41cv. This was a machine that offered a young engineer the promise of doing anything - from controlling peripherals to all kinds of calculators. I have been following with attention the HP41cl developments, and I find extremely interesting the old, loved 41c body with throughly modern innards - and sometime I will get one. But it just does not fit in my pocket.

Therefore I took the plunge and download the full version i41CX+, with CAS. Let me state first that I have not been able to delve into the CAS, since I have been exploring the different modules available (the CAS is one of them). It works basically as the original one, and it has been adapted to the longer screen of the iPhone 5. Lest I forget, it is not free, but close to 25 € (once bought, you cannot see the price in the store). Let me say that it fully justifies the purchase.



You can download a huge number of modules - among them many I have not heard about; and you can download as well all the overlay layouts that go with them. It works exactly the way the original did - with the difference that it can run much, much faster.

 

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About the HPCC Journal

www.hpcc.org

We have received the June-August number of Datafile, the HPCC journal. Edited by Bruce Horrocks, it is a journal made for us. I have mentioned it on previous blogs, but it is filled with interesting information for those in our hobby.

HPCC stands for Handheld and Portable Computer Club. One would have said that the initial two letters had another meaning, since all units being discussed are from Hewlett Packard.

The website url is www.hpcc.org.

The journal is a little booklet, A5-sized (for our american readers, the A-series of paper sizes is the standard in Europe), with 32 pages, devoid of any publicity and full of calculator related information.

There are news about calculators, hints and tips for calculator DIY (there has been a series on repairing the 9800 series of calculators,with detailed instructions and explanations about the inner workings of these machines, articles about programming in both RPN and RPL, a for sale and wanted section (that was empty in this last issue, since it is a very recent addition to the journal), and the story of an HP calculator in each issue, written by none other than Wlodek Mier-Jedrzejowicz.

In past issues, there have been articles on other scientific areas likely to be of interest to calculator users like science history, astronomy, etc. It is amazing, by the way, the number of common interest we do have part of calculators. I have met some of my customers, and we never fail to have another hobby in common - and not a normal one!

The club is celebrating its 30th anniversary, and will have its annual meeting on the 27th and 28th of October in the Imperial College in London. As it is stated in the journal, "no need to register, no charge for attendance, not even for the pie!"

I hope they do not mind if I copy the agenda!

No need to register, no charge for attendance, not even for the pie!

Saturday 27thSunday 28th
10:00 Rooms open 11:00 Registration
11:00 Welcome 11:30 Home built ROM Modules for the 9830 by Tony Duell
11:30 Calculator Displays; Past, Present and Future (part 1) by Hugh Steers 12:30 Calculator Displays; Past, Present and Future (part 2) by Hugh Steers
12:30 Inside the 9125 Plotter by Tony Duell 13:30 Lunch
13:30 Lunch 14:30 The History of HPCC by Wlodek Mier-Jedrzejowicz
14:00 US Conference Report by Wlodek Mier-Jedrzejowicz 15:00 Break
15:00 Break / Short talk if any late entries   Time for two more presentations - offers welcome
15:30 Anybody Can Make a Calculator by Danish Ali 17:00 Thanks, farewells and wind down
16:30 Break

17:00 HPCC 30th Birthday Party with real pie!

18:00 Wind down and arrange evening meal for those staying over

This is what our conferences look like



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