 A graphing calculator made by Texas Instruments. Actually, its
more like a TI-92 than anything in the TI-8x series, except it
is trapped in the standard TI graphing calculator body. Well, it
may not be allowed in SAT and whatnot, but it definitely was
forbidden in every single mathematics exam I had in lukio
(Finnish equivalent of high school, roughly), including our
graduation exam (matriculation examination). No wonder, either;
like said above, it can solve equations, integrate and
differentiate, even if it's pretty limited. Not exactly knowing
what the machine does, I'd guess it has some builtin shortcuts
to most common integration problems and basic formula fiddling
mechanisms. Even if it understands basic logic (you can use
'and' and 'or' in the symbolic solver), it breaks down quite
fast with anything non-obvious, such as most of modular
mathematics I asked it.  Also, its programming language sucks.
No, seriously. TI-BASIC is evil. However, TI-GCC supports 89,
which means you can actually move to writi