This is a nice emulator.
Amazing. Just got my ti-89 titanium used as an upgrade from my broken ti-84+SE. Used to ti-boy by calc84maniac, i did not expect anything decent from this emulator, but i forgot that its called '68k' for a reason. It's a different processor! Pokemon Red's intro runs at about 28-30fps with a frameskip of 2. I hardly notice the frameskip. After that, you may want to increase it a bit. Be sure to disable SRAM in save states if you chose pokemon, because it takes a VERY long time to compress. Otherwise, just hope no one (e.g. your maths teacher) notices the 'compressing...' text on the screen.
It's a shame there's no 'crunching' (scaling) feature, but I still am impressed! Besides a few minor graphical bugs that come with a work-in-progress (i know Ben dropped work on it but at the time this was to be a WIP), the whole game is quite good. The bugs are barely noticeable, so don't worry too much about them.
Would be 10 out of 10 if not for pokemon, but its an RPG with a turn-based battle system, so it's not too important.
Readme is not incredibly instructive; I was confused when i ran out of RAM on a ti-89 Titanium. If you just archive EVERYTHING you can, you should be fine :) Other than that, be sure to add the game rom files to a folder other than the 'main' folder.
'What if I told you...
THAT YOU CAN PLAY A GAMEBOY ON A TI CALCULATOR!'
What's not to like? sure, it's not a perfect emulator, but the sheer awesomeness of playing video games in math class is overwhelming. Get this program, NOW.