I find it so surprising that I got a HP48 young, felt in love with RPL, then later liked emacs, then later loved lisp and realizing they were all connected.

“The only downside is that, like any advanced Emacs functionality, if you don't use it frequently you forget all the commands.”

I thought this was happening only to me... but I’ve ditched Vim and went Emacs 100% so it’s bit better now, since I’ve been stuck with using both for like a year.

And an HP48 emulator is still what I use on my phone as a calculator.

For the reason you mention, I need to get into the habit of using Calc for my quick calculations; right now, I usually use Google (ick, infix notation) or dc.

I've have Free42 on my Android phone. Do you have a particular emulator to recommend?

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http://thomasokken.com/free42/

I use Droid48: https://play.google.com/store/apps/details?id=org.ab.x48&hl=... (https://github.com/shagr4th/droid48)

Thank you. I saw that one. Some of the more recent critical comments (stability, responsiveness) gave me some pause.

I'll give it a go.

I'm the same! None of the native RPN apps even come close.

RPN is so efficient when you are running a series of calcs when you learn it. I feel icky now if I use algebraic input or calculator and I have to backspace. It's like using a word processor, not a calculator! I am in Emacs all day for all things. It is a big mess of a world I like muddying about in!

I fell in love with smartphones (iPhone) when I downloaded the HP41 app. I feel ya.

I keep an HP48 in the office and an HP28S at home.

I might buy another HP28 for the car. :D