Is it possible to hack the Casio FX-82SX Plus calculator to make it solve equations like the FX-570MS?
Its (temporarily) possible with a FX-82MS: video
I've noticed Casio puts the 82SX Plus together with the 82MS and a bunch of others in one manual (and they look very similar) so I guess they have the same board and chip?
That would mean it might be possible to possible to expand most of Casio's two-lines-display series to 570MS functionality