My calculator started displaying these settings when i turn it on. Is there a way to reset it?

I can only find this on the UK website, and I can’t import it through there. I love the design and I’ve had no luck on second hand sites or eBay. Any way for me to buy this in the USA?

Dear all, hope this is the right place to ask.
I'm looking for a calculator that has LCM (lowest common multiple) for my son.

I tried the Casio FX-991 CW on Amazon (called the 2024 edition) but even if it advertised as having LMC, it's not there. I have read here on Reddit that it might depend on regional versions (I'm in Italy). So I will send it back.

Anyway, could anyone suggest a calculator that has LCM, possibily one that has no "regional versions" or different names depending on the country?

Thanks in advance :)

Nice little calculator. Notice how the "5" has most of its segment out. A bit of battery damage, but not too terrible.

Is Casio fx-350es Plus 2nd Edition allowed for PRC Board Exams? Confused lang since nakalagay kase sya sa list but for 2nd edition not sure.

I just got the TI-84 Evo-T and wanna know what games you can download on it(bcs it's only tetris, pong,... and that's kinda boring bcs the other calculators have geometry daaaashhh...)

Im not a calculator person, but I found it in a bin at a boot fair with other electronics that were deemed "junk". I bought it for a pound. I think its original case as well.

I fell in love with the display

It still calculates things properly.
I tried removing the battery and putting it back in
I tried the reset button
I opened up the calculator and found no visible damage (although im not an expert at figuring out what damaged stuff)

Hello, was wondering if there is anything like this https://imgur.com/a/niPtgSJ but for the 991 ex rather than 991 es? Nothing is labelled similarly inside the calculator (KO or KI) so I was wondering if anyone has already figured out how this works.

I was charging by ti-84 plus ce and it was okay but about 2 hours later, I saw that the battery disappeared??? Like the green bar isn’t anywhere and my gc was really hot… I was using a charger that I had recently bought from a seller online, could that be the case?

Bin am testen von RPN83P. Ich habe den Stack mit Zahlen gefüllt und ]2nd] [U] gedrückt für rolls up. Habe keine Reaktion bekommen/Stack hat sich nicht verändert. Wo ist mein Fehler? Was mache ich falsch?

Hi

My son's Casio FX cg50 back light has suddenly stopped working. Settings are at max but it doesn't change the brightness at all whether I go up or down so it's as if the backlight just isn't even working. Is there anything I can do to check what could be wrong? Is there a repair for this? I have seen there are screens available on AliExpress but would this solve the problem and is there a teardown video anywhere? I've got some experience with soldering and can definitely do a screen swap if it's a case of tearing down and replacing the screen via a ribbon cable (like on a Gameboy which I've done before). Any help would be great because I'm sure you know these things aren't cheap or easy to get hold of.

Thanks in advance

I've had this one for a while. Still works. No issues. I've upgraded since but still enjoy it.

Hi all,

My fx-CG100 has a little issue where it's not giving me several answers in surd form and won't let me convert. For example, when I input 4x⁴-31x³-31x+4=0 into the polynomial function, the answers should be 4 ± √15, but the calculator doesn't output these! It just gives the unsimplified number...

Even worse is that the two non-real answers are also in surd form but present perfectly fine!

Any way to fix this? I've had this issue with π answers too...

I need help with my calculator my calculator screen has strips and i cant see my numbers properly i need advice how to fix this

It keeps doing this but I really need it for school

Hi everyone!

I've been working on a native Linux emulator of the Soviet Elektronika MK-61 and MK-54 programmable RPN calculators.

These machines are an interesting part of calculator history. They have their own programming model, unusual numerical behavior, and some fascinating hardware quirks.

My goal was to preserve the authentic calculator behavior while creating a comfortable desktop application for Linux.

The project uses the original EMU145 microcode emulation core and a custom C++20 / Qt 6 interface.

Some features:

• MK-61 and MK-54 emulation
• Authentic RPN stack, registers, and keystroke programming
• Hardware-driven vacuum fluorescent display
• Optional four-row display showing the T, Z, Y, and X stack registers
• Mouse and physical keyboard support
• Program import/export
• Open-source under GPLv3

It's still a work in progress, but I'd love to hear what other RPN and vintage calculator enthusiasts think about it.

GitHub: https://github.com/lz1aam/elektronika-mk61

I'm particularly interested in feedback from people familiar with the original Elektronika calculators or other classic programmable RPN machines.

Is there differences to be aware of doing python on a calculator vs in any other application? I'm wanting to make a little python script to help out for budgeting and stuff, just to help figure this thing out. Also so I have an excuse to use this 100 dollar calculator outside of exams n stuff

L to R:

HL-4a

fx-82MS

fx-82MS 2nd Edition

fx-82ES PLUS 2nd Edition

fx-991ES PLUS 2nd Edition

fx-991CW

original post: https://www.reddit.com/r/calculators/s/4GWAwki4Uc