Yeah. You don't have 1/3 of the ROM calls needed to port Penguins to the 83+. That's the first thing I could beat you at. Then I'm make a jump table at 4000-5FFF that supports original 83 programs. Me and a friend wrote CrASH, probably the best coded OS ever considering the limitations we had (1000 bytes max). -- Barubary > Hilarious!