A gift from my Calculus teacher upon graduation.
Yes manual included. Sadly the 0 (zero) button no longer works, due to battery corrosion... ☹️
this post was submitted on 27 Apr 2024
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Probably the 0 button going bad XD
IIRC, the 83 model fixed some issue with the accuracy of fractions or something like that.
Already said that in my original post, but thank you Mr Quicksand!
I might manage to fully fix it one day, I think it's a corroded via.