Lmst

J’adore ces machines où l’UX est… mécanique.
La HP-46 (1973) combine calcul scientifique, RPN et imprimante intégrée : tu obtiens une trace papier immédiate et le clac-clac vaut un ASMR vintage. 😄

A lire : https://www.silicium.org/index.php/blog-catalogue/ordis/hewlett-packard/hp46

#HP-46 #HewlettPackard #RetroComputing #VintageTech #RPN #OldHardware #GeekHistory

HP-46 : Si ça ne s’imprime pas, est-ce que ça a vraiment été calculé ?

RPN - rätt sätt att räkna på.

Joachim Klahr använder omvänd polsk notation i sitt programmeringsspråk Quadrate, och insåg att han räknat på ett sämre sätt hela livet.

Ett utdrag ur Kodsnack 690 - lyssna där poddar finns eller på kodsnack.se
#podcast #rpn #quadrate #hpCalculators #ti83

Usare la calcolatrice RPN HP Free 42 su debian

#rpn hp free42

video
https://youtu.be/0cTu6hv3K2k

RE: https://mastodon.ml/@volandevsrat/116022729946941274

#софт #TRH #идиоты #математика #калькулятор #RPN #Android

...Вот именно поэтому для подсчтета всякой бытовой херни у меня есть какулятор в обратной польской нотации 😉 Всё лежит в стеке, нет «алгоритмического» порядка операций 😉 нету скобок, понятно даже ребенку с первого раза. На #FDroid гуглить RPN Calculator, вот этот самое огниво при том, что прост как три копейки.

@futurebird User of HP calcs since the 80s, not everyones cup of tea. #RPN: Removal of parenthesis during calculations. Having operators before and after operands to calculate arbitrary expressions translates to speed and clarity of input.

#LIFO / #stack / #geoinformatics <https://www.hpmuseum.org/rpn.htm>

1983 JUNE: STS-7 Astronaut Sally Ride aboard the Challenger with a couple of HP-41c to positively make sure re-entry calculations were correct.

source https://www.nasa.gov/history/40-years-ago-sts-7-and-the-flight-of-sally-ride/

https://airandspace.si.edu/collection-objects/calculator-hand-held-hp-41/nasm_A19890003000

@bitzero i went to uni in the late 70s to early 80s, & i was in the opposing camp... i chose to swap my hitherto #sliderule for a TI-59, with its dinky little magnetic cards & internal motor, + #RPN also, ofc. several of my friends also bought the same one, though one went for the TI-58. other friends did go the HP route, specifically the HP-41C iirc. fun times.

@miraicorp #rpn python calculator https://github.com/dnparadice/PyCalc

"All Hewlett-Packard pocket calculators feature RPN logic- the most sensible logic system a pocket calculator can have!"

This beautiful short introduction to #RPN (Reverse Polish Notation) is from Hewlett-Packard's Pocket Calculator Buyer's Guide printed in 1975.

"If you will look at the keyboard of any HP calculator shown in this catalog, you will see that none has an "=" key. Nor are there any keys for parentheses. None are needed.

Instead, all HP calculators have a key like this: ENTER. Thanks to this key, and RPN logic, you get four major advantages you don't get with most other calculators."

Short explanation of RPN by HP, 1975.

The MINUTEMAN * 6X was an early calculator by #Commodore from 1974, the company that was later famous for legendary computers like the Commodore 64 and the #Amiga family. The #MINUTEMAN supported #RPN (reverse Polish notation), had a 2-level stack and arithmetics for integers and currency values.

MINUTEMAN * 6X, an RPN calculator introduced by Commodore in 1974.

Display of the MINUTEMAN * 6X, an RPN calculator introduced by Commodore in 1974.

Back of the MINUTEMAN * 6X, an RPN calculator introduced by Commodore in 1974.

macOSではプリインストールの「計算機」がRPNモードを備えています。また、App StoreにあるRPN Anywhereも使いやすい(150円)。
Androidアプリはたくさんあって、私はハードのHP-42Sを使っていたこともあってFree42をよく使います。

#RPN

いまでもRPN電卓ソフトを作っている方がいるんですね＜BT
私は四則演算用の電卓を自作して使っています（もう5年になるのか、現役です） /
200LXのキーを使ったRPN電卓、リベンジ編: パドラッパ - https://pado.tea-nifty.com/top/2021/01/post-385fec.html

#fedibird #RPN

逆ポーランド記法電卓のススメ
とオープンソース開発者の募集

RPN電卓はとても良いものです。
Win16時時代にあったフリーソフトを、弊社がWin32/64用に模倣したWHP32を無料で公開していますので、ぜひお試し下さい
https://www.mirai-ii.co.jp/products/soft/whp/

弊社では帳簿を書くときの計算に必須アイテムとなっています。

現時点でほぼ完成しています。
国際化対応も済んでいて、(表示が変わるのはメニューだけですが)日本語、英語、台灣正体字、エスペラントで言語切替が可能です。

ですが、更なる多機能化の可能性に期待して、「オープンソース化」を計画しています。
ソースはC++ with STLで書かれたシンプルなものですが、興味ある方が複数おられれば、GitHubにリポジトリを作りたいと考えています。

興味ある方はメンションなどでご連絡くださいませ

#Fedibird #RPN #オープンソース #OSS

I'm out of touch in that only last year I learned that #HP calculators are no longer produced. I still use my #33S, but but if I want to replace it, I need to buy one on E-Bay. Apparently handheld calculators with buttons and #RPN are thing of the past. Time flies.

forsp... forth + lisp

https://xorvoid.com/forsp.html

#plt #lisp #forth #rpn #lambdacalc

These are my recommendations for the iPhone apps that emulate various #HP #RPN #scientific calculators, in the ascending order of capabilities:

Of those, my favourite is the HP-15C emulator. The vibe I get from this app on my iPhone is almost like when I use my original, 1980s HP-15C. And that is a high praise for this app, considering the massive difference between HP's venerable tactile keys and the iPhone's vapid touch screen. Oh, and, it is free!

The original HP-15C from 1982 was my first programmable #RPN #calculator. I bought mine in 1985. By then, I was an upper-level #EE student, with a few years of #programming experience in a handful of languages from different paradigms, including assembly. Yet, I found keystroke programming on the HP-15C to be a challenge.

This little machine could store only 500 keystrokes in its memory, and the instructions were shown as numeric codes. It was rather like programming on the ET-3400 or the KIM-1—it was a right mess. Still, the HP-15C was the best engineer's pocket computer I could afford then, and I thoroughly enjoyed learning to use it well.

Not long after, when I entered the industry, EEs were all using MATLAB on Sun workstations, and our RPN calculators mostly sat on the desk. That was the beginning of the end for calculators. Yet, to this day, the HP-15C remains my all-time favourite RPN calculator.

PS—Those who are curious about programming the various HP RPN calculators may read my article on the subject.

https://amenzwa.github.io/stem/ComputingHistory/HowRPNCalculatorsWork/