I just thought I'd share this cool site I found. It's amazing what can distract you when you sit down to work on your taxes. My HP 42S RPN Scientific calculator needed batteries, so I couldn't start right away, but while my wife was running errands (including getting batteries), I was sitting at the computer with the 42S sitting next to me... It turns out there are some real aficionados (to put it politely) of these old HP calculators. I'm not that way personally. If you want mine, you can come get it...from my cold, dead fingers...
I was just disappointed that I couldn't find an emulator I could upload to my Nokia N80 phone (Series 60, runs Java, in case anyone is bored). I suppose I could look into compiling the C source code into Java, but dang, it's been a long time since I've done anything remotely like that, and I'm sure there would have to be some modifications for usability with the phone's keypad.
http://hpmuseum.org/