If you write programs for the 89/92+ in C, download TI-GCC. It is well documented. > can you also suggest a document to read if i would like to get involved in > writing 68k porgs As for flickering gray scale, there are ways to adjust it, but the game may not have it. I know there is a function in TI-GCC which can adjust it, but I'm not sure if the game uses the same method as TI-GCC does. B Clark