HP 48 User RPL and System RPL (SysRPL) Programming Comparison

The HP 48 calculator is programmed using Reverse Polish Lisp, RPL, however, the RPL available to the end user, is actually a small subset of a larger, richer, RPL language, which the HP 48 calculator’s operating system is actually written in. To distinguish between these two versions of RPL, the standard user accessible RPL is called User RPL and the richer superset is called System RPL, or SysRPL.
A simple User RPL program to sum the squares from 1 to n is shown alongside an equivalent System RPL version. The performance of the programs is then compared for the sum of squares from 1 to 2000.
Jazz System RPL and machine language development environment for the HP 48: www.hpcalc.org/details/1670
Introduction to System RPL and Assembly Language by James Donnelly: www.hpcalc.org/details/7114
Faulhaber's formula: en.wikipedia.org/wiki/Faulhab...
- Contents -
0:00 Intro
1:10 User RPL and System RPL programs
3:28 Test programs and compare performance
4:21 Program completion comparison
4:29 Closing

[@Egzoset]

I'd LOVE to get a Linux-based HP-48 emulator directly available in pre-installed "Live CD" form! Mine's still in good working order and it will be missed when it dies, eventually, even if it's only to use it well below its true capacity.

[@CalculatorClique]

Interesting. x48 runs on all platforms and you can use alongside your day to day applications (eg for work etc). I worry about how long mine will last - they are not easy to open or repair (well, not for me) and one I have already has 2 failing keys making it basically unusable 😔

[@larsneely4640]

Two 48GXs with black LCDs, you lucky dog!!!!

[@CalculatorClique]

I was lucky until one of them developed the permanently on '0' key problem even though the key travel is fine 😔. Not sure I'm game enough to open it to try and fix it (or possibly destroy it/make it worse) 🤔

[@michellespinasse8455]

@@CalculatorClique You probably already know, but: 1- the calculator will most likely work if you press lightly on the top left part of the keyboard, say above the second function key, and 2- I've heard good things about adam jones / mainely calculators WRT fixing these.

[@CalculatorClique]

Thank you - it was the first thing I tried but mine appears to have a different issue. I have seen others report the same thing where the '0' key is permanently on even though it has normal travel and click. Might by lint. It's in excellent condition otherwise. I do have a few Pioneer models with exactly the problem you mentioned but I haven't been game to break the rivets and pull these apart yet.