Thanks for writing! I'm impressed by your dedication and effort, but also a thanks for your writing style, which was really easy to follow. I've read a lot about the SNES and Mega Drive before, but you've given me the best understanding of how the sprite updates per frame are limited by CPU time (and it's nice to see someone else who suffered with bad 50Hz versions). Are you tempted to try this for another console. I've always wondered how horrible programming the N64 must be!