Daniel,
In the ROCK manual what does it list at U2, U3 and Prom 1 on the parts for the CPU?
Some system 80b games used a system rom at U2 and/or U3 and a game prom at PROM 1. We need to make sure your not missing the system ROM? It is possible that the ROM you have been supplied does both, but without the manual I am not sure as I am not familure with this game?
