General > General Technical Chat
LOL! My Calculator Crashed!
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tom66:
The original Casio FX-83GT (and related versions) had a firmware bug where if you nested too many fractions you would cause the calculator to draw garbage on the screen and corrupt the system memory.  Skilled 'hackers' use these bugs to overwrite memory and enable features not shipped on the default variants.
mag_therm:
I have owned HP calculators for 37 years.
I think I went through about 5 in that time and most were HP35scientific.

and the reason is.....?

Reverse Polish entry. I got used to it and can't stand the algebraic.
george.b:

--- Quote from: DiTBho on December 31, 2020, 09:57:45 pm ---
--- Quote from: george.b on December 31, 2020, 08:44:30 pm ---
--- Quote from: DiTBho on December 31, 2020, 04:04:06 pm ---
--- Quote from: Ed.Kloonk on December 31, 2020, 04:01:30 pm ---Wonder if it runs Doom.

--- End quote ---

No, it doesn't. It's not hackable, there is no SDK, and it only has 64Kbyte of ram :D

--- End quote ---

Wikipedia seems to suggest otherwise. It says the OS is sitting on a Mask ROM. I'd imagine it wouldn't be impossible to substitute it for an EEPROM and make it run something else.

--- End quote ---

And what did I say? "not hackable"  :D

--- End quote ---

Yes, and I'm saying it might be ;)
SiliconWizard:
Opening it would help determining how hackable it is.

If it uses conventional SMD parts and a 2-layer PCB, as I suspect, reverse-engineering it should be doable. And if the ROM itself is in an indentifiable package, one could probably read it, disassemble the content and from that try and figure out memory mapping, keyboard access, LCD... etc. I'd be curious to see the innards!
GlennSprigg:
Use a Slide-Rule... No batteries required !!!   8)
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