Copy II+ 9.1 has the right parameters for this game. Let's see how it works. Use a patched DOS 3.3 to get a copy, boot and after a few screens it hangs: 5BA6:20 AF 5B JSR $5BAF ;check... 5BA9:B0 01 BCS $5BAC ;if original 5BAB:60 RTS ;then Return To Sender. (6502 Elvis!) 5BAC:4C AC 5B JMP $5BAC ;else loop forever ... Track $05 sector $0B byte $A6 change from $20 to $2C Why change three bytes when only one is enough? Notes - The previous crack replaces the copyright screen with the usual (in the 80s) pirate's signature. - images/games/action/submission.dsk and images/games/simulation/submission.dsk are the same thing.