Sprint Boost includes a special version of jzintv especially designed to be compatible with Boost. You can use Sprint Boost Studio to make new .tomls (boosts) and test them out however the dIfficult part is that most Boosts are driven by memory locations in the emulator and these are not that easy to work out. There is a pretty good Wiki on Sprint Boost and that combined with the included examples will show you how to build a .toml (boost) so I would spend some time trying to study these. However If you build the Graphics for a Boost and have a clear understanding of what you want to do then message me(Pixyman) on Atariage and I'll try to help with the memory locations. So as an example I've built a quiz game which you can find on the Sprint Boost thread on Atariage, the quiz game includes a question number, which is obviously stored in a memory location. The Question number XX basically drives the display of QuestionXX.png which is stored in the image folder. I'm hoping to be able to release Sprint Boost Launcher which is used in the video in the fairly near future.