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Ed wrote

I'll second the vote for RealCalc. It's extremely useful.

A moment of truth here.  I'm a long term fan of HP reverse polish notation calculators. So RealCalc's RPN mode suites me just fine.  Except for the amazing scientific calculators you can get for about $12 (mostly marketed to middle- and high-school kids), it's a wonder there's any market left for scientific or financial calculators. Smartphone apps are so powerful, full graphics and dirt cheap.

I will check out RealCal.

Your mention of RPN brings back memories. I could not afford the HP35 when it was introduced. I was envious of a colleague who had one. By 1975 I was the proud owner of an HP21. I remember the saleman describing how indestructable it was and dropping - almost throwing - it to the floor.

I think that packed away I may still have some copies of the HP Journal for that period. I found it a great read. The technical detail seemed to be at my level.  HP employed some very skilled technical writers.

For many years I was a fan of RPN but have not used it for some decades. I  took a perverse delight in writing computer programs in Forth.   I wonder if Forth could solve the equations for Hc, t and Z?  I suspect that it could. There is probably a Forth app for a smartphone.