@chrishuck @leffe All they do is #RPN! https://mastodon.social/@bondo/111516485729579693

@chrishuck No, if I recall correctly, I used #RPN only a handful of times long time ago and without calculator.

Part of me feels like I can predict the results of this, but the #fediverse surprises me often.

When you use your #calculator (or calculator app), do you use #RPN mode?

(Please boost for reach)

My current #RPN calculator collection from the 1960s to early 90s…

“Gramps”, an HP-35
“Woodstock”, an HP-21
Three HP-41s, “Nutella”, “Sticky”, and “Halfnutz”
HP-32S II
HP-42
“Turtles”, an HP-48G.

Despite what people say I don’t think I have a problem. I can quit anytime. Really.

#retro #math #Corvallis

A few minutes ago in a second hand shop I noticed a calculator under a bunch of others which had an ENTER key. Yay, it's an HP. No batteries. But for €2.50 it looks like a bargain so I'll take the risk. Brought it home, put new batteries in, and... it's not RPN !

HP, why have you forsaken me?
#hp38g #hewlettPackard #rpn #calculators

@ariadna How does it compare to Unix's dc(1) ?

If you're on Windows or Android you might enjoy the HP16C clone (an RPN calculator) written in Java... WRPN.

One of the @ioccc judges also has an interesting arbitrary precision arithmetic calculator. While not using RPN, it is written in C.

#C #RPN #Java

@vk2bea @troy @ieeespectrum I’ve been reviving old HP #RPN calculators. The thoughtfulness that went into these instruments is surprising.

And then I try to print a multi page document to a recent HP printer and it just pukes and hangs. Many times the on/off switch doesn’t turn it off because the designers were more concerned with blinking, tune playing amusement than creating a robust tool. Ugh.

This is awesome! A new #programming language to create #Music called #sapf. It seems to be a #RPN language like #Forth.

https://www.youtube.com/watch?v=FY2WYXOdXoM

Sally Ride with #HP-41C #RPN #calculators—in space....

At this point I have three HP-41s in various stages…

“Nutella” is fully functional.

“Haffnut” is non-functional but I think I know what I have to do. Here I have a picture of the battery + module block restoration in progress. The part of the keypad PCB that contacts the battery block needs thorough scrubbing w/ DeOxit.

“Frankie” is on life support in a medically induced coma. Not sure if he’s gonna make it.

#HP41 #RPN #RPNcalculators

#WingAndaPrayer #HP41 #RPN #retroComputing

Waiting for the 5 min epoxy to dry on my repair to my Frankenstein HP-41 #calculator. I like having a backup machine in case my daily driver breaks.

It’s got a spare parts keyboard but I had to replace the LCD screen after I toasted the original by resoldering the pins on the LCD itself, which I later learned is a no-no.

here's some code from a jupiter ace emulator i started making in my programming language

it's so cool how compact and small code in stack based/rpn languages can be

#programming #rpn #postfix #langdev #emulation #jupiterace

@octothorpe Wow, look at that hot HP-41C in her pocket!

I was just resoldering the connections to the LCD on mine trying to get it to work again. Now if I could just find an IR module on eBay for it.

#RPN

I have purchased a few new #electronic devices over time, ranging from vinyl record players (decades ago) to mobile phones (months ago). But none of them hold a candle to the excitement associated with gently unpacking a new #HP #RPN #calculator and cracking open that thick #programming manual.

My choices were never the best that money could buy, just the best that I was able to afford. Nevertheless, I recall vividly those moments, despite the passage of time.

Ta-da… from eBay to cleaned up + functional HP-35 #RPN calculator.

Even tho I was being careful I managed to drop those damn keys and the brass part of the power switch on the floor. There was no good way to restore plastichrome stripes so I sanded them off. I kind of like the minimal appearance.

Only things needed to make it work were rechargeable battery and fix the power switch.

May be urban legend but they named it HP-35 because it has 35 keys.

Acting on a mad impulse I bid on a lot of 3 vintage #RPN calculators. So I now have a new hobby - retro calculator restoration.

The HP-35 looks pretty rough. I can’t tell if it works. I’ll need a battery and charger. I plan on disassembly and thoroughly cleaning.

The HP-41 came with a quad memory module. I imagine the keypad internals have almost a half century of dust. Not sure if a tear down is worth it or not.

Pour les fétichistes.

https://www.youtube.com/watch?v=d7EKFHRzwcU

#hpcalculator #HP15C #RPN

A formula for three-input exclusive OR using reverse Polish notation and only the NAND operator (spaces added for clarity):
C C AAB⊼⊼ BAB⊼⊼ ⊼ ⊼ ⊼ AAB⊼⊼ BAB⊼⊼ ⊼ C AAB⊼⊼ BAB⊼⊼ ⊼ ⊼ ⊼ ⊼
Symbols:
- A, B, C: push that input bit to stack.
- ⊼: pull two bits from stack; if they're both ones, push 0, otherwise push 1.
After the formula has been evaluated, the stack contains one bit: 1 if 1 or 3 of A, B and C were ones, otherwise 0.
#programming #math #rpn

"In today's video, we'll take a look at my grandfather's vintage HP-45 #calculator from 1973"—so he opens.

As an #EE who used #HP #RPN calculators for my whole career, that word, "grandfather", hit me hard.😀

https://youtu.be/56nq_FNll6Q?si=m-he0vNtIriQTzhO

@GhostOnTheHalfShell @dlakelan You betcha! Forth was my third programming language I ever learned. The first compiler I ever bought, for my Sinclair #ZXSpectrum. My main calculator on my phone is Free42, a HP 42S simulator. My physical one has gone the way of the dodo a couple of years ago. #RPN