Casio Fx-991es Plus Not Working

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Barton Ostby

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Jul 24, 2024, 10:29:55 AM7/24/24

to snowotmonke

same problem occured my casio fx-991es plus. i changed battery same problem occured not turn on my calculator but working while solar. so i opened my calculator i check the wire connection solar wires are connected properly and battery black wire it mean negative line cut down. i fixed that issue now my calculator working finely. thanking you.

I had the same issue, replaced battery but still didn't work but it works on the solar panels if flashed with a light source. I opened my unit and what happened to my calcu was the black wire were slightly corroded and a with a touch it suddenly snapped at the soldered point. I soldered in back in place and it came back to life.

casio fx-991es plus not working

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You re lie I am calcalater man I rip all tha calcs thats what us pros call the calcualtors dont worry I can help at all points just come to address here namaste fremnd Dundrum Rd, Friarland, Dublin 14, D14 W0V6

I had this problem too I opened my calculator still couldn't figure out what was the problem so what I did was my cal works on solar power as well so I turned my cell phone flashlight on and I held my calc display in front of the light and it worked it's not supposed to work when I light is

Then pressed enter. The cursor would be glitched and the calculator would enter a glitched state were you typed stuff in, but it did not appear to do anything, but upon pressing enter, you would see that it did, and it would return to normal. You could also get a < on the screen by typing past the screen so that the screen would scroll in normal usage.

1. 6 left key presses, although you dont see what you typed. Pressing enter crashes the calculator and I did once get it to show what I typed to get to this glitch mode, so it could be like an overflow glitch or similar.

Hello there,

I just found this forum while searching for things to do with my fx-83GT PLUS now that I no longer need it for school... (I also have an fx-85GT PLUS, although the screen is sadly cracked.)

I tried this on a fx-85GT PLUS and it worked the exact same way and I found out that if you press M+ or shift STO any letter instead of equals it will stay on the same screen until you press the arrow buttons it will show M+ or the letter you pressed.

When I tried this on a fx-85GT PLUS it worked the same way then I tried it again but after I pressed equals I pressed the S->D button then it showed a glitch string on the top row of the display (also works if you press shift S->D or shift FACT) if I pressed the arrow button it would be invisible and the cursor would stay in the glitched place if you press the right arrow button 9 times (to make sure the cursor is on the furthest right) and press delete once and press equals it should say error and exit the error using the arrow buttons the it says (a)+b because the letters were invisible but were registered in the calculator and you removed x̂ which crashes the calculator. If you try this glitch without the brackets or divide symbol it works but the S->D glitch symbol is slightly different.

Make sure that the cursor looks like "l" not"_" by pressing "shift, del", now move the cursor to the furthest right and press equals, if everything goes well you should see the "Complete! press AC to continue" menu which is also show after a reset (if you don't see this menu, restart the glitch and replace "e" in "aANSXexby" with the pi symbol), now press ON,there is a chance that you stay in stat mode if not go back into stat mode submode 0 to do the next glitch.To do another version of the glitch, delete "a" in "aANSXexby" and at the end of the glitch move the curser before "e" in "ANSXexby" and everything else is the same and before you press anything after pressing equals you might see glitched symbols and if you move the cursor you will see less of them or you might see the press AC menu. To do another version of the glitch repeat the first glitch but "e" in "aANSXexby" is replaced with RAN# (shift "." button) so it's "aANSXRAN#xby" Delete "a" so its"ANSXRAN#xby" it should open a menu called conversion number where you enter a number between 1 and 40 and after you enter a number it goes back to before and if it crashes press ON. Please reply if you found something new about these glitches and new calculators it works on.

Today I found a very strange behavior in Mode 68 (991ES Plus). Enter Mode 68, type any rather complex formula with subscripts and superscripts, execute it (it must execute without errors), then switch to LineIO and recall the formula. All "level change" places (normal to subscript/superscript/fraction etc.) will become bold A..E letters. WTF?

An even more strange thing with my 991ES Plus. Enter Mode 68, type 2 3/4 (mixed fraction), [=], switch to LineIO, recall the formula and erase the @ character in front. Save the number into a memory register (e. g. A) and try to calculate 1/A (the reciprocal key will also work). You'll get an error without an error message. Two empty lines, AC/on Cancel, [] Goto. WTF???

PS, today I found a strange mode in FX-83GT plus. To enter it, try to reset all and immediately press ON (the interval must be very small, less than 0.1 s), in the same way as described for Mode 68. The device remembers the history (as in Mode 68), but (unlike Mode 68 on 991ES Plus) is ALWAYS in LineIO, with comma instead of decimal point and without the angle unit indicator (but actually it uses degrees). What is it?

Actually ES Plus / Gt Plus series calculators have not two, but THREE Pd jumpers. The third one (Pd4) is the P146 point on the PCB, short it to the common line of Pd1 and Pd2.
PS, are these pins processed in the firmware? If not, what is their purpose?

I thought I should join this forum so that I can learn more about Casio calculator hacking. I have multiple calculators, but the ones I'm really interested in hacking (because the others are programmable) are the fx-85GT Plus and the Classwiz fx-83GT X (which the latter is probably much harder to hack due to its youngness). I'm also considering on getting an fx-991 ES Plus or an fx-570 ES Plus to do a bit of more advanced hacking on as I currently am only using user202729's emulator for the fx-570 ES Plus!

Can you tell me what's wrong/what I'm doing wrong here (please explain like I'm 5 years old lol)? I'm using the most recent version of fxesplus, and I'm just trying to compile hard119.asm to see if I can get at least something that looks like a hackstring/keypress list. I can give you more specific details if you need to debug this error!

Also, I'd love to know more about the syntax of the .asm (assembly language) files such as what flavour of asm it is (eg. Intel? ARM? Okay, maybe not them exactly!) so that I can start running hacks on these cool calculators! I'd love to get something like Hello, world! working on it, but that'll be probably in the slightly-distant future.

It's just a text file format I made up to simplify the process of writing ROP chains. Not any existing
flavor.
(in retrospect, I think I should just use Python or some programming language instead. Lisp is often used
for that, but other languages would work just as well, if not a bit more verbose)

Currently there's no documentation for that, only the comments in the `libcompiler.py` file.

Because this is ROP, there are a lot of limitations(you can lookup ROP online).
It's not as easy as programming in assembly.

However there are still some people who can figure it out and even use it to write something useful.

Hi everyone, new to the forums but have been lurking for a while without an account now. Currently I am looking into a specific phenomenon where 5*9 (9-pixel height) characters are converted into 5*6 (6-pixel height) characters by inputting a relatively simple hackstring. Usually when you use a input with the A and B coefficients in the 5:Reg menu in abnormal STAT mode, you should just get garbage, but for some reason I've managed to output a result that really is just a human-readable small font variation of the input.

1. (7979(7979(7979(7979r - Enters Vector mode, which is not supported by the fx-82AU PLUS II

2. A(BCr->M v/[] (Square root) - Enters Mode 68 with LineIO without crashing the calculator, Press AC/on, then [BACK], delete every thing except for the box. Now move the cursor to the left of the box, then press [RIGHT] once. Initially, you cant see what you are typing until you have typed about a dozen characters. You have now achieved basic overflow.

I know most of the resources for ROP were developed for the 991/570-ES PLUS - and 82ESPA, etc calculator hacks aren't as developed. But would I also be correct to say that ROP programming similar to what has already been established on the 991, is also applicable to the lesser versions like the 82? And in this case, I know there's quite the amount of resources for these models, could someone make a similar version (basically port it) for other models.