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What calculator do you use ?
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sdg:
HP-41C.
And the thing to its right is a Ti58 undergoing heavy surgery. It suffered a nearly fatal electrolyte leakage from the battery pack. After some cleaning and resoldering of several component, the calculator restarted, but the keypad is dead...
jlmoon:
HP 67 & HP 25, still the best in the business.  eh, for the old school guys!

Sometimes if I can stand to wait, I might use the Computer but the 67 boots much faster. 

atferrari:

--- Quote from: PA4TIM on December 01, 2012, 05:18:22 pm ---, non functioning processor, lots of damage by salt water. Probably not fixable. Both are not mine but from a museum.
--- End quote ---

Sea water?  :P
rr100:
I think I have a new favorite for 2015: Sage.

I am a long-time (~20 years!) Maple user (and that was my go-to program for anything more than what you can put (now) in Google Calculator). However using software that starts from triple digits for students and goes (easily) into thousands for anything commercial at all is totally a show stopper in most cases I deal with. I have nothing at all against commercial and even expensive commercial turnkey solutions but they aren't for what I deal with. Plus I didn't like the programming part at all in Maple.

Using something GPLed or similar to do math just feels better. I was actually surprised to recently find a somewhat old document:  http://wstein.org/mathsoftbio/history.pdf where William Stein (Sage's Linus so to speak) basically expresses the same feeling (plus he does something about it instead of wasting time for 20 years like me).

Of course over the years I tried (as well) SAGE but it was breaking too easily, it would not install without extra steps, etc. However now it just works. It installs on ubuntu (and most likely on many other distributions) with one command.

And programming is python-based (the modern language I am most productive in, not that it means much). And there is a public server anybody can use if you don't have linux and you don't want to bother with a virtual machine: cloud.sagemath.com

What more can you ask for?
retrolefty:
HP 32S II RPG is my goto calculator. Over the years I was frequently amused when someone would ask to borrow/use my calculator for a quick results only to see them stare for way too long looking for the equals button.  :-DD
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