Looking for TVM contributions

[dm319]

Ah thank you Rob, I found it hard to find the date of the Sharp.

I can see they both have the n/i/pv/pmt/fv keys in that order (I guess established from the HP-37E onwards).

In terms of UI - do they work in the same way as the HPs, in that a second consecutive press of those buttons triggers a 'solve'.

The solver built into the HP-83+ is a right pain to use. It is set out like a table, then you use alpha-solve to solve for a specific value. You can calculate in-place (i.e. you can put 24x60x365 as input), but there isn't an intuitive way to do chain calculations on it. I.e. problem 2 is not fun to calculate as it needs constant to and fro-ing out of the application to the 'calculator' and back again.

Always had a fondness for Sharps - probably because that was my first one in a school that was 99% Casio.