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It feels like a David vs Goliath thing. In the midst of all the horsepower at my workstation (PC, MacBook Pro, cell phone, tablet) I still reach for my 1980's vintage solar powered Casio Fx-411 for a quick calculation or decimal/hex conversion. Each time, a small part of me is wants to fire up a spreadsheet, desktop program, or mobile device app. But before I can make that call, my Casio has completed the job and gone back to its parking spot. It could be nostalgia leading me to my Casio, or it may be as simple as the right tool for the job. Anyone else have the same little mental battle when you reach for the good old calculator?
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What's wrong with the Windows calculator?
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Nothing really. I think it's just faster to pick up the Casio. That's really the question.
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My Casio fx-5000F rides around in my laptop case.
I bought it for a college class (possibly VAX MACRO 11 assembly) in 1989, the instructor said we'd need to convert between decimal and hex.
But lately I just use the Windows calculator.
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I probably used mine for PDP-11 assembler as well. Although I think I was working on a LSI-11, which was about a 12" tall chassis in a 19" rack. Much smaller than a PDP, but the same instructions. Too much fun.
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~5 years ago the solar cells on my trusty old TI-?? died... 
Since then it's been Windows Calculator. Seemed odd for a couple weeks but like all things, it's now the new normal and frankly saves a bit of desk space. 
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A few years ago my original Casio died. It has a plastic flip open case, with standard push button calculator on one side and a full set of membrane function keys on the other side. The plastic hinge gave up. I picked up a replacement on EBay for just a few bucks. This kind of points to nostalgia as my motive for continuing to use it.
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Have a look at SpeedCrunch.[^].
"In testa che avete, Signor di Ceprano?"
-- Rigoletto
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Very nice calculator.
Does everything but kiss and tuck you in!
The most expensive tool is a cheap tool. Gareth Branwyn
JaxCoder.com
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That looks really cool. Thanks. I'll give it a try.
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You are welcome.
"In testa che avete, Signor di Ceprano?"
-- Rigoletto
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SpeedCrunch my desktop favorite for years
"A little time, a little trouble, your better day"
Badfinger
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My Sharp EL-5020 sits by my phone: I use it more than windows calculator - I just find it quicker to use.
But ... don't most people just use their phone these days?
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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If I am already sitting at the PC... I use windows calc.
If not... I try to use my head.
If I am too tired or I don't feel like it, then I use phone App.
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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I go for the calculator (rather than phone) for ease of use. By the time I get my phone awake, PIN entered, or biometric scan, and swipe to an App; my Casio has already found the hex for 1048658.
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The number you really want is 12648430 ... ![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I still use my Casio fx-260 solar on occasion but more likely to use Windows calculator.
The most expensive tool is a cheap tool. Gareth Branwyn
JaxCoder.com
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I frequently pull out my cell phone for this purpose. I have a RPN calculator on it. I also use the Windows calculator if I'm at my laptop.
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Found an emulator for my old HP 41CX on it. Still have the CX (batteries out, of course), but only use the phone anymore.
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How far back in history do you have to go to find anyone under 30 who knows what is meant by "RPN"?
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Would have said me, but, well, I'm not under 30...
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I'm not 30 yet
And not only do I know the meaning but I also used it for a while 
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"Really Perplexing Notation?" 
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I was pretty sure it would be just you but a few other old farts people replied saying they also use calculators.
Anyway, I don't even have one, so depending on whether I'm using the Android phone or Windows PC, I use an app. For Windows, just the inbuilt app. For Anroid, I use Realcalc.
Cheers,
Vikram.
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RealCalc is my favorite Android calculator as well. I have mine set to RPN.
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