I have been testing some things out on my fx-83GT PLUS, and I have found a few interesting exploits. I'm not exactly sure how they work, but I'll detail the most interesting:
Glitched String: In STAT submode 0, enter 'ᴀᴀ+x̂' (small A (SHIFT 1 5 1), small A, plus, x hat (SHIFT 1 5 4)), then press equals. This should throw a math error. Use the arrow buttons to exit out of the error, then delete the two 'ᴀ's and the plus, and input a number before the x hat (I use 3, but others work - I'm not sure the requirements). It should look like this: '3x̂'. Then press equals. Nothing should appear to happen, but press an arrow button and a glitched string appears!
I think this puts you into a glitched error state, but as I say, I'm not sure.
Tested on an fx-83GT PLUS (not mine) and I can confirm that this works. Nice find Eris600! This does not work on my fx-991ES PLUS VerE, so this seems specific to GT models.
EDIT: This definitely corrupts some memory somewhere, as pressing the equals button again just hangs the calculator like everything else does.
EDIT2: You can put anything before the x hat, of any length, as long as it wont cause any error screens to appear. Also, what are these other exploits like? One of them may not seem interesting but perhaps could cause buffer overflow or some other corruption/glitch that would lead to arbitrary code execution or just some other cool effects. Also, it appears that you can put anything instead of the + in the ᴀᴀ+x̂ part of the exploit and the length of it doesnt matter.
Edited by TheAwesomer, 26 March 2019 - 01:53 PM.