I wondered how hard it would be to upgrade Jetpac to Chroma colour. That was on Saturday so it took most of week of spare time. As you would expect re-tooling an existing game to handle something I didn't plan to do with it provided some challenges. However, I think I have got it done. This version runs on both original and chroma hardware. I'll crank up my original ZX81 over the weekend and try it out on the real thing. In the meantime, let me know if you find any bugs or have any suggestions.