I carried for a long time an HP 200LX palmtop (runs DOS). I used and loved two apps on it: Derive, a math program, and the equation solver built-in to the 200LX calculator app. Derive wasn't really easy to use as an equation solver / general purpose calculator, but otherwise it rocks.

I am exploring the possiblity of using a dos emulator on a C860 with derive. Seems clunky though.

I want something like the equation solver that was built into the 200LX, and it would be fantastic if it were also about as functional as Derive (think of Derive as a sort of precursor to Mathematica).

Basically, I'm thinking there HAS to be a killer math app out there for this. I'd rather not use the TI or HP48 emulator that is floating around.

I have been using the spread sheet app for some physics experiments.. I actually record the data and do the calculations right there (and boy that is every grad student's dream!).

What is out there? What do people want? Is there an X/QT app anyone would like ported to the Arm? I used the 200lx for the better part of 10 years with derive.. so this is an important project for me!!