I would like to convert my TI-Basic game into a computer game, but I can't find anything with a similar I/O format. Does anyone know of one?
What about just regular BASIC?
Well regular BASIC is similar to what the BBC Basic app uses. I would actually suggest Microsoft's Visual Basic. This was the first computer language that I learned after the calculator's BASIC, and I was surprised at how easy the convert was. I have actually done a convert from TI-BASIC to Visual Basic once.
EDIT: If you choose Visual Basic, I may be able to help you if you want.
Projects: BexIDE (hold), Hadean.NET, Legend of Zelda: Link to the Future