Scientific Calculator Fx-82ms [BETTER] Download

Since these calculators are products used as educational tools for long periods of time, materials that ensure robust key durability and prevent wear or fading of key markings are used to ensure product quality.

High product quality prevents key malfunction due to drop impact if a calculator falls to the floor from a desk in the classroom or display (LCD) or key breakage if a calculator is accidentally crushed in a schoolbag.

Scientific Calculator Fx-82ms Download

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A sticker printed with a QR Code* and hologram is affixed to each CASIO MS series calculator package. A product can be authenticated by scanning the QR Code and confirming it using the Web Authenticity Check System and examining the hologram.

So, I wanted to hack it of course. I already have experience in reverse engineering and exploit development ( -javierf/). Nevertheless the calculator scenario is much more complex, at least for the casio fx-82ms which isn't programable.

the most interesting thing is that he found that the hardware beneath the buttons is in fact a matrix keyboard. There are more pins (keyboard combinations) that were actual buttons in the calculator, so he analyzed that and found that some combinations can be triggered to directly activate extra modes from the superior model. I have a hardware setup for that I'll show off as soon as possible. The software layer is still pretty much unexplored, so that's why I'm here

When the hack is reset (power goes off or if you hit the [ON] button), you wont be able to perform it again until you use the 'Matrix' hack (similar to the above, except using '1313..' and then hitting DELDEL instead of AC/on at the end to show all the 13131's to the right of the cursor and deleting them until the '0' is under the cursor and the rapidly alternating sintansintan until a full reboot happens).

If you do attempt this hack again before performing the 'matrix' hack, you can get some weird LCD segment issues, or the calculator may just switch off. I found that a full memory clear is insufficient to reboot the calculator fully* (I just discovered that removing the battery and shorting the cap which should reset the calculator proper bought up a 'matherror' message, but the hack still worked. After another battery reset I had mixed success with the hack, but once the 'matrix' hack is used it seems to work every time, so there might be something sticking around in memory even after the matrix hack).

While applying this hack works on my fx-95MS, it won't allow you to perform Matrix or Vector operations. The key layout does seems to be the same as the fx-570MS and all the additional functionality seems to work except for Matrices and Vectors (Equation solver, integration, differentiation, constants, conversions). I also noticed that the the fx-82MS is slightly faster than the fx-95MS.

Also worth noting is that display flags set while the hack is active are kept even after the hack is reset (power off or [ON] button). Mostly this doesn't mean anything, but if you enable ENG symbol display mode it will stick around even after power off if you want to keep that engineering symbol notation.

The PCB's have some different markings, but look to be at a quick glance very similar. Maybe a closer look might reveal some differences. If anyone is interested in some pictures, I could look at giving my old Nikon a bit of exercise and get some pictures of the boards.

fx-82MS:

GY313-1

HA210314A-1

04266 (year, day, month?)

fx-95MS:

GY315-1

HA210303A

07246

Edit:

Same for me. Even removing the battery doesn't seem to clear the memory completely, I once left the calculator without a battery for a whole day so all capacitors are drained as well, and I still got mixed results.

I have read somewhere (I can't remember what site it was) that older models of those calculators didn't have the big black piece in the middle of the PCB, and that the black piece is preventing us from hardware-hacking the part of the PCB that determines what modes can be selected.

After a bit more messing about I think you are right about this. My theory was that the missing pins 88, 89 & 90 might have something to do with selecting the actual model of the calculator. I scraped away a bit of the coating on pin 90 and found it was tied to the negative terminal or ground on the calculator. During the wire bonding process (before putting that black gunk on the top of the CPU), perhaps a combination of pins 88,89 & 90 are wire bonded to this ground to select the model. Unfortunately I'm not really an electronics person and only have a rudimentary knowledge of electronic stuff. I started however slowly drilling into the black gunk between the CPU (very slowly with a screwdriver) and where I believe the wires might be bonded to to see if there were any there. I didn't hit any after making about 1mm of progress, but decided I didn't want to risk permanently disabling the calculator without actually learning anything useful that I could use on the fx-95MS.

"Same for me. Even removing the battery doesn't seem to clear the memory completely, I once left the calculator without a battery for a whole day so all capacitors are drained as well, and I still got mixed results.

That is unusual. I did short the capacitor for a minute or so to make sure it properly reset, and it usually did the trick since the '53535' hack wouldn't work unless I did the '131313' matrix hack first, indicating to me what I thought was a successful reset. Though I can't rule out that I'm not successfully resetting my calculator to despite how it seems.

"I have read somewhere (I can't remember what site it was) that older models of those calculators didn't have the big black piece in the middle of the PCB, and that the black piece is preventing us from hardware-hacking the part of the PCB that determines what modes can be selected."

Do you mean the COB (Chip On Board, that black gunk covered chip), was easily accessible?, that would be rather handy and make life easier as you could compare the wire bonding between different models. I figure that the actual calculator software is hardcoded on the ROM to save costs, but it would be interesting if the software was actually contained on a built in EEPROM.

Something interesting from the manual: "If the above steps do not correct the problem, press the 'ON' key. The calculator performs a self-check operation and deletes all data stored in memory if any abnormality is detected "

When the '1313 upgrade hack' is applied and 'ON' is pressed, all variables and mode settings are cleared. This means the '1313 hack' puts the calculator into such "abnormal state" mentioned in the manual, while the '5353 hack' does not, the current display and mode settings are kept in that case. ff782bc1db