I got a NVRam 6264 for Mononoply pulled the ram out of U212 installed the NVram. Turned on the game and got weird sounds and the screen is all messed up. Went into the test menu and it said. Check sum $5EFF = Bad Ram. Took it out plug in the original Ram better sounds but still says $5EFF. I'm super confused. I can start a game but the graphics are warped and it wrong values. What the hell went wrong? Thanks!