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Hello.
I managed to get me a Casio CFX-40 and I also found a manual online.

The calculator chip in Casio CFX-40
https://www.ithistory.org/db/hardware/c ... sio-cfx-40
in the watch, is from a Casio FX-82 .
https://www.ithistory.org/db/hardware/c ... asio-fx-82
Now I have discovered an error in the Casio CFX-40 PDF , manual from 1985.
On page 10 there is a "Roots" calculation and first it say (V=Root)
V2+V3+V5 = 5.2871969 but calculated it is 5.38233234744
Right of this calculation, is a graphic on how to press keys on the wrist watch and it say
V2+V3 x V5 = 5.38233234744 that gives the correct answer in the manual.
So to the left, there should be a multiplication between V3 and V5 , as there is in the graphic to the right.
So now I wonder.
Am I the only one since 1985 , that seen this?
Anyone else?
Regards MagI