Hi Brett,
When the display fills with lines, can you still play the game but just can't see the display? You may have more than one problem, I would measure the voltage on the back of the DMD. The power supply which drives this often require rebuilding or have dry joints on the back. For the memory problem, I would measure the battery voltage across the ram chip pn the main CPU board to ensure it is recieving the correct voltage. I can repair the boards for these games if you get stuck.
regards Derek
I agree - Dry joints and the fuse holders on the power supply board. Check the 5V connector to the DMD board. When the problem re occurs, gently tap the connectors on the DMD board.
