30-07-2021, 06:38 PM
HP have always had RPN at least as an option. The later calculators were (and still are with the Prime) astonishing machines.
But I too bought a Sinclair Scientific back in the day. You could fool it by asking it to find the root of a negative number, or the arcsin of something greater than 1. And it tried valiantly, with the display flashing fitfully, for several minutes before it returned a wrong answer. I replaced it with a TI SR56, which was great for the next three years, then went HP through several generations to the modern day. If you do something daft on a Prime it just says "Error".
I even converted my wife to RPN; she's an accountant, and uses her HP12C daily.
Craig
But I too bought a Sinclair Scientific back in the day. You could fool it by asking it to find the root of a negative number, or the arcsin of something greater than 1. And it tried valiantly, with the display flashing fitfully, for several minutes before it returned a wrong answer. I replaced it with a TI SR56, which was great for the next three years, then went HP through several generations to the modern day. If you do something daft on a Prime it just says "Error".
I even converted my wife to RPN; she's an accountant, and uses her HP12C daily.
Craig
