Online HP-12C Emulator

I bought mine over 15 years ago while enrolled in an MBA program and still use it regularly. I can do NPV, IRR, and FV calculations before my colleagues have even fired-up their notepad computers.

Not nostalgic for me either! I use one every day at work, as most commercial real estate appraisers do.

I got through engineering University with a 15C and had it for many years until it finally died. I figured I'd just buy a used one on Ebay until I saw the prices and nearly fell off my chair. I wound up buying a 48GX (like smokeandoakum), and while it's still reverse polish, it just isn't the same -- it's big and clunky and full of a zillion features I don't need. The 15C was king ...

I also had a 16C which was a special programmers' model. It was almost completely bereft of other functions though ... great for assembly language programmers, but not much else. Well taht one I subsequently sold on Ebay for @200. Sweet.

I´m one of them Tweeker hehe.

@ted - because the notation was introduced by a Polish mathematician. For more info, do a Wikipedia search on "reverse polish".