After looking for a long time, I finally found this #Sliderule, which belonged to my late father. Some of you will know that these #devices were used, before the advent of digital #Calculators, to perform #arithmetic operations such as #multiplication and #division to about three significant figures, by #scientists and #engineers. Not only is it of sentimental and historic value, I think it's a testament to the skill of those who have made high-precision instruments through the ages. To this day, #CircularSliderules are used by trainee #Pilots to do #calculations and to convert units, etc. To me they're a thing of beauty as well as utility.

#Mathematics #Computation

The mystery of the rogue HP calculator: 12C or not 12C? That is the question

For most of us, a calculator might have been superseded by Excel or an app on a phone, yet there remains a die-hard contingent with a passion for the push-button marvels. So, the shocking discovery of an apparently rogue HP-12C has sent tremors through the calculator aficionado world.

The HP-12C [PDF] is a remarkably long-lived financial calculator from Hewlett-Packard (HP). It first appeared in 1981 and has continued in production ever since, with just the odd tweak here and there to its hardware.

Murray wrote a lengthy blog post on the topic and put together a battery of TVM tests designed to stretch the TVM solver and found to his, and others, surprise, that not all HP-12C units were equal. Dubbing the unit the “rogue edition,” Murray demonstrated some worrying bugs and differences in the “rogue” hardware, which was shipped from Brazil, versus another unit.

So his test may be useful to others to do a check on their HP to ensure it is 100% accurate. Maybe even a rogue version is found to be accurate, so it won’t be proof that a calculator is an original HP.

See theregister.com/2024/09/21/hp_…
#Blog, #calculators, #retro, #technology

Arduino Nano Powers Reverse Polish Notation Calculator

#arduinohacks #retrocomputing #arduino #calculators #retrocalculator #hackaday
posted by pod_feeder_v2

Hey everyone, I’m #newhere fresh in from pluspora pod. Here's a bit of a copy-pasta intro:

I'm mostly about #retrocomputing and #computerhistory with a bit of #vintagecomputers thrown in. Also #calculators especially #rpn and programmable. I like green spaces and days which not overcast, #space and science and history. I read a fair bit of fiction these days, including #sff. I like languages, both human and computer. I'm from the 70s culturally, 80s technologically but the 60s biologically. I avoid talk of current events. I try to be an ally.

I co-moderate https://retrocomputingforum.com

I am a cat-lover, but one cat at a time. A serial felinophile.

I like #brianeno for his music and his thoughtful writings and funny videos, I write just a little code in #python and #javascript and #assembly and generally spend a lot of time on the internet.

I should mention open source and creative commons too.

Isn't the world a lovely place but in a fine old state though?

Thanks for the invite, @Andrew Pam!

DIY Infrared Calculator Printer

#handheldshacks #retrocomputing #calculators #irprinter #irda #redeye #sir #hackaday
posted by pod_feeder_v2

The SwissMicros DM41X is a faithful recreation of the software environment of the HP-41CX, one of the most versatile calculators ever created and the first alphanumerical calculator, in a mod

This is a purchasable hardware clone of the original HP-41CX, but with an enhanced and larger display. You can easily share or back up your programs or your entire DM41X environment and use hundreds of existing, professionally developed software applications with this rugged calculator sporting a stainless steel case and a Gorilla Glass screen.

Even by today's standards, an HP-41 remains a very versatile and powerful programmable calculator. In its day (about 40 years ago) it literally acted as a backup for various tasks on the NASA Space Shuttles. I still love my original HP-41CV, which still powers up and works after all this time. I've been recently trying to get one of my original programs entered and running again, which I wrote in the late 1980's on it. I bought a new HP 50g with this in mind... but found the HP-41CV still way easier to use!

On the software emulation front, HrastProgrammer makes an excellent 'HP-41C/CV/CX MicroCode Emulator for Windows' (and which runs just fine on Linux with WINE), but it is now a paid version unless you still find one of the free versions floating around e.g. try searching for 'HP 41CX Emulator written by Warren Furlow (Release 7B)'.

See SwissMicros Model DM41X RPN Calculator

#technology #retro #HP41CX #calculators #DM41X

The DM41X, another member of our flagship line-up of RPN calculators, is a faithful recreation of the software environment of the HP-41CX, one of the most versatile calculators ever created, in a modern hardware architecture.

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https://gadgeteer.co.za/swissmicros-dm41x-faithful-recreation-software-environment-hp-41cx-one-most-versatile-calculators

middle to high...

#middleschool #highschool #calculators #boobies #die

How to Find 'Stalkerware' on Your Devices

#mobileapplications #computersandtheinternet #datamininganddatabasemarketing #computersecurity #contenttypeservice #domesticviolence #smartphones #software #androidoperatingsystem #privacy #stalkingcrime #iphone #calculators #appleinc #googleinc #science #news