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Reviews (10)
06 Dec, 2020
Glowing Christmas angel
Very nice bright glowing multicolour (LED) angels with glitter that gets stirred up within the body of the angel. 3 AAA batteries are used but doesn't use much juice due to the LED light. Gives a lovely atmosphere when the room lights are off.
The only down side is that the batteries run out fairly quickly due to the swirling water/glitter effect, much better to have a mains powered one, but they don't make it.
05 Sep, 2014
The humble HP41 still going strong and exciting new developments
3 of 3 found this helpful Here are my investigations and experience with using the HP41C and exciting developments done by some very dedicated enthusiasts of the HP41 series, hope you find this interesting and gives you other options in using and extending this great calculator.
The HP41C, CV & CX are good solid calculators with decent programming capabilities, the previous reviewer is right about the fixing posts that tend to shear when dropped or if opened quite a few times. The posts can be repaired see hp41.org site.
The card reader is OK, but the rubber grommets that push the program strips through to read/write tend to break down and gum up the drive mechanism. Also eats batteries up at a fast rate.
A modern alternative is the PILLBOX which will save/load programs from your computer via a serial USB cable which is a much better reliable way of saving/loading programs. Also text editors are easier to write or amend the programs.
The pillbox site is http://www.jeffcalc.hp41.eu/hpil/
You can contact Jeff Garnier email jeffcalc@wanadoo.fr, I have the PILLBOX and it works very well. Note this can be used with the HP71B as well and the latest version transfers at 25% faster speed.
The HP41CL developed by Monte Dalrymple
Another modern alternative to the HP41 is a replacement board with modern CPU and memory which can run up to 50 times faster and the speed the CPU runs at is programmable. The other big advantage is that you can save many programs directly to the on board memory, this memory is 100's of times larger than the original. Also the other advantage is that there are 70 plus rom images which covers just about every rom type ever produced for the HP41. So you don't have to pay a fortune to buy all the commercial ROM programs (when new ROM images are found they can be added to the main memory, you get all the latest rom images).
The board is an easy swap over replacement for the original board, this is not cheap at $200 but is a very high quality product developed for over 10 years and a lot cheaper than buying all the rom modules. This brings the HP41 to new heights of technology, an old calculator in sheep's clothing, this upgrade will not be disappoint. I have this new board in HP41C, although CV or CX can be used, check with Monte which ones work with the board. Very early or the half nut (latest version) may not work or you will have to contact Monte for different display drivers etc to be added to the system.
Monte's site is http://www.systemyde.com/hp41/
Another clone for the HP41 is the clonix which I believe allows the rom images to be used similar to Monte's replacement board, not sure exactly it does but here is the site http://www.clonix41.org/
Another useful site with lots of programs and technical details about the HP41 and also articles how to restore and repair the HP41. You can buy a DVD with all the technical manuals, many 100's of programs, application manuals, etc for a very reasonable cost (at $40 is very good value) and this helps keep the site running.
The site is http://www.hp41.org/Intro.cfm
I hope this article is of use to let you know where the main resources for the HP41 are and what else is available to extend the life of a humble programming calculator. My 1st programable calculator was the Casio FX502p which I bought about in 1978. Then I bought my 2nd the HP41C in the beginning of the 80's when it came out and I have written many scientific and engineering programs with it, both are still going strong today :-)
02 Sep, 2020
High Quality Yuasa batteries
Yuasa batteries are more expensive but high quality, so I would say that they are very good value for quality and price. I have had other Yuasa batteries and they have lasted 8 - 12 years. The premium gold batteries are more expensive and come with an additional one year on the guarantee. So you takes your choice. I would recommend them as they perform very well and keep their overall capacity for many years without any problems.