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There is tons of software for TI calculators. Check out ticalc.org if you haven't already been there. I wouldn't try to run linux or anything on it. That would be way too much overhead; the poor little calculator would be busy doing all the OS functions and wouldn't have a chance to run your program. Just write your program using the standard TI basic or asm.
 
I have TI-89 Platinum and its a really nice graphical calc...for the gadget guru in everyone this is one that has better screen resolution and more tinkering toys for it.
 
the plat just has some more memory and usb capability (and a few built-in programs that you can optionally get for the regular 89 anyway, like EEpro)


anyway, linux on even a ti-89 is gonna be very very tough...the cpu itself would be entirely feasible since it's just a 68k variant...but memory is gonna get in the way. You're gonna have to do an extensive amount of kernel hacking to get it to fit and run inside the allotted memory in a ti-89 (far less than even the 2mb lower limit that linux expects).

anything below an 89 looks pretty much impossible...something like an 83 just doesn't have the memory, period. An 89 may work if you're very meticulous about minimizing code size.
 
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