Unfortunately it's a ridiculously shitty hardware platform to be developing for in 2009. It's a motherfucking Z80, for $100 -- a vintage Game Boy minus any decent sprite graphics hardware, with enormous profit margins and a captive market (enforced by regulation) of a million a year.

Yes, the OS on the TI-83 is dogshit, but I have a feeling that it's pushing the limits of what's reasonable on the hardware. The TI-89 has a terrific input language and OS (almost mac-like compared the the apple-II-ness of the 83), but running on a m68k.

Who knows, maybe someone can at least make a firmware that not only forces you to close your parentheses, but gives you some benefit for doing so.