Casio College fx-80 : which IC hides inside ?

[Mark]

Hello,
I own a Casio fx-80 (yellow LCD) and for a long time I've been wondering about the chip it uses : all my searches were unsuccessful, which is surprising for such a popular machine.
Of course I could disassemble my calculator, but since it involves detaching the display, I wouldn't risk that : I don't have any spare.
Could it be that someone already revealed what circuit it is ? That makes me think about Jose Mesquita and his very nice disassembly articles :-)

Thank you !
Marc