![]() ![]() It is impossible to clean the inside of the display without significantly dissassembling the device. This causes the the two case halves to separate slightly, causing the calculator to work intermittently, or not at all.ĭisplay cleanliness: Dirty environments can enter the calculator case and stick to the display glass inside the calculator. One of the longest produced line of calculators, Hewlett Packard manufactured the HP-41CV and HP-41CX for over 11 years, until late 1990.Īs any HP-41Cs for sale will now be over 25 yeears old, it is important to have information on some key things before purchasing one.īattery corrosion: A very common problem, when the alkalines are left too long in the calculator and corrode the battery contacts, and in severe instances, the electronics inside.Ĭase integrity (broken posts): The screws that hold the calculator together are inserted into plastic that tends to crack and break if the calculator is dropped. ![]() So capable that Hewlett Packard called them handheld computer systems. A quantum leap in calculator technology in 1979, it was not challenged until 1987, when the first early graphing calculators were introduced. The HP-41C Calculator, although over 33 years old, is still quite popular with technical people. Great calculator: Things to look for when buying a used one. 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 :-) Read full review My 1st programable calculator was the Casio FX502p which I bought about in 1978. 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. 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. 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.Īnother 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 Īnother useful site with lots of programs and technical details about the HP41 and also articles how to restore and repair the HP41. I have this new board in HP41C, although CV or CX can be used, check with Monte which ones work with the board. This brings the HP41 to new heights of technology, an old calculator in sheep's clothing, this upgrade will not be disappoint. 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. 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). Also the other advantage is that there are 70 plus rom images which covers just about every rom type ever produced for the HP41. 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. ![]() Note this can be used with the HP71B as well and the latest version transfers at 25% faster speed.Īnother 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. You can contact Jeff Garnier email I have the PILLBOX and it works very well. Also text editors are easier to write or amend the programs. Also eats batteries up at a fast rate.Ī 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. 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. ![]() 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. 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 humble HP41 still going strong and exciting new developments ![]()
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