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I want to learn about simple Casio Calculators.


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#1 micket

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Posted 02 March 2021 - 10:01 PM

Hello, i'm new to the forum. I just want to learn about the simple casio calculator models like the fx-82ms.

 

The only calculator similar to these ones that i own is a very weird "Helect" branded casio fx-82 clone, it has no branding other than the Helect logo, no serial numbers, nothing.

 

I took apart the calculator recently and i realized that the only thing inside was an epoxy or some kind of resin blob, with a rubber membrane keyboard and lcd connected to it.

 

I would like to know what hardware this is, ways of "hacking" or messing around with it (if it's even possible), and know about how they work basically.

 

I researched a bit about this early this week, but i didn't find a lot of information regarding the hardware, the only "hacks" or something similar people know is the secret functions glitch, which doesn't work on my clone model, i don't know why, maybe it's just not compatible, or i'm doing it wrong.

 

Judging from the price i don't think these calculators are programmable, but if they somehow are, i would like to know how to mess around with them a little bit, mine has 12 5x6 pixel boxes or sprites to draw numbers and symbols, those numbers and symbols have to be stored in some kind of memory inside that blob, if there was a way to modify that data, that would be awesome.

 

 

Anyway, hope i learn something from this! Thanks in advance  :rolleyes:



#2 anon34

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Posted 02 March 2021 - 11:52 PM

Clones are usually (I think) complete rewrite of the firmware, or small modification of some other clones.

 

So they will have different bugs.

 

It's not easy to reverse engineer hardware nowadays. People usually scrape off the first layer and use a microscope to take a picture of the chip, or use a hair dryer to remove the epoxy, something like this. I've never done that myself.

 

If you can find an emulator online, it would be a little easier to determine the CPU model and things, by reverse engineering the software.


Edited by anon34, 02 March 2021 - 11:53 PM.





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