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casio fx-85ES Plus Thai version conversion challenge

calculator haking fx-85es plus

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#1 Tai



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Posted 02 June 2020 - 03:32 AM

Would anyone happen to have a permanent conversion from the casio fx-85ES Plus to a FX991?

this is for just for fun(I know that I can buy the more expensive version), but I am willing to solder,cut traces,dissolve epoxy and other random/difficult things for this goal, have tried about everything on the internet, but my version does not have the jumper and it does not overflow the eeprom? from any of the ways that I have tried.



Edited by Tai, 02 June 2020 - 03:33 AM.

#2 anon34


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Posted 19 June 2020 - 12:36 AM

Some of the features of the 991ES PLUS calculator is not present in the ROM of the other models. So it's not possible (unless you can somehow rewrite the calculator ROM)

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