RPN is the only way. I used an HP 32SII and then an HP-49G. Love it. So many comments are right. Once you use RPN, algebraic calculators are almost impossible to use.
I used to have the Sharp that had 24 characters (PC-1211). Long calculator. Looked cool though. Also had a TI-55 back in the day. Not bad either.
“Sharp that had 24 characters” — LOL. I’ve got a lawn irrigation app (Hunter Hydrawise) and they report out all 24 digits of precision for my water consumption. Forget the fact that the flow meter probably has all of two significant digits. The app designers (probably young kids with zero real world experience) coded up all 24 digits for me.
The problem with that is it slows down comprehension, quick scans of data and comparisons. I’d rather read “20.1 gallons” or even “20 gallons” than “20.156823493 gallons.” Who cares if I put down 20 or 20.1 gallons of water? It doesn’t make a lick of difference.
I wrote to the company about the absurdity of their water usage reports, but they blew me off. It would be such an easy fix for them, too.