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‘The HP 35s (F2215A) is a Hewlett-Packard non-graphing programmable scientific calculator. If you want a new physical HP RPN scientific calculator you can still buy the HP-35S for around sixty bucks. (Get the file vc_, even if you are runnin a 64-bit system.)”
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“If Free42 does not run as is, you will also need to download and install the Visual C++ Redistributable for Visual Studio 2015 / 2017 / 2019. In Windows if Free42 won’t start, the solution is very likely explained in the README.txt file contained in the download.
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To upgrade Free42 delete the old files in the install folder and unzip the new downloaded. To uninstall Free42 delete the install folder. You can ignore the Free42Binary.exe file, the difference between the two files is explained in the README.txt file contained in the.
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zip archive into a folder anywhere and double-click Free42Decimal.exe file to run it. In Windows, Free42 is a stand-alone/portable application. Some great experiences, all started off by the tech school having a program to introduce students to industry – lucky I did well in programming, paid really well too…Ī couple of notes about Free42 and Windows:ġ. Site visits with Peter Moore under management by Ray Stubbs. Used a Pace-16 by NS, paper tape 2708 aprons, with an 8 deep stack 16 bit fixed point computational shell all written in assembler ie the code all subroutine calls to the complicated equation to assess mass flow in tonnes per second from differential attenuation of beta particles (Cs137 upgraded to Co60) through a falling magnetite ore curtain with scintillation counters each end exactly one meter vertical separation – nice formula to get absorption to mass flow !Ĭalibration an issue with a work around for transience via a Kalman filter written by Indesa Rajasingham who visited Mt Newman mining circa 1978-9 to interface his filter and my code to a Foxboro controller.
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My first experience with Forth, which prepared me well for RPN, was a nice piece of software on a nucleonic ore flow gauge measuring (mostly) realtime iron ore flow mass pre grading screens written initially by Dav Gibson Pretron Electronics. Indeedee do dee, may the forth be with you.įwiw. Posted in Retrocomputing Tagged calculator, hp41c, retrocomputing Post navigation We wonder if the KIM Uno or 1802UNO could be made to run on the same hardware? Seems like it would. We’ve seen another fake HP41C that we think is using the same emulation software but required SMD soldering. Still, what a great calculator and it is fun to see it reborn in modern form. Also, as great as the HP41C was, it didn’t have binary or hex or even octal math unless you used “synthetic programming” and though we imagine the emulators used can handle synthetic programming (sort of assembly language for the HP41C) it was never fun to work on non-decimal problems with this machine. For everyone else, it is usually a bit of a learning curve. Of course, HP calculators used RPN, but if you grew up with a slide rule that’s fine. Then again, the schematics are there so maybe someone will lay out a nice HP41-specific board. We were a little sad that the kit is in an HP15-C like landscape orientation unlike the HP41’s portrait format.
What we really liked, though, was the 3D printed cases you can download for the calculators. The display is also backlit, something we all wanted in the original. The machine also has over double the memory the original calculator had along with a real-time clock built-in. As you might expect, this version uses a through-hole ATMEGA328 and even at 8 MHz, the emulation is faster than the original calculator. You can see the device in action in the video below. In fact, the HP emulator will also act like an HP15C or 16C, if you prefer. Didn’t have one? Don’t worry, you can now build your own. It really was a little hand-held computer.
If you’ve ever had one, you know that is a marvel of the day’s technology with alphanumeric capabilities and four plug in ports for more memory or ROMs. The HP41C was probably the pinnacle of that trend. But there was that awkward time when calculators were very important and computers were very expensive that calculators tried to be what we needed from full-blown computers.
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If you really need serious number crunching, you’ll turn to a full computer. Sure, calculators are still around, but you are more likely to use your phone. Then there was a time when we all carried calculators. There was a time when engineers carried slide rules.
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