Do you have screenshots or a video? I cannot run it it seems (Java exception error on startup)
Glad you are participating, by the way
EDIT: Nevermind I got it to work now. But I think you should use a TI-82 Advanced, because it would fit your description more. The TI-81 doesn't even have a getKey command, let alone an Output() one, so it might be better if you used the TI-82 Advanced or TI-84 Plus-T.