I have (2) Moon Patrol PCBs.
They are both doing odd things:
Board 1: The UFO sprites are messed up. Especially the one that drops the crater bomb. Every other frame shows garbage. And, the bombs are screwy looking on a frame.
Board 2: The background sprites blink and flash and often get replaced with a solid colored rectangle
Do you know what board in the stack would cause each of the above? I was thinking I could combine both boards to make a perfect working one but am not sure what combination I should be using. Or, could this be something else?
I have reseated chips, harnesses, etc.
I am using the high score save kit. If I remove it, I have the same issue. So, it's not the ROMs as these are replaced by the high score save kit. And, if I put the original roms back in I have the same issue.
I am using a switcher kit. I am getting a perfect 5V out of the switcher. I also tried it at +5.1v. Same issue.
Thanks!
They are both doing odd things:
Board 1: The UFO sprites are messed up. Especially the one that drops the crater bomb. Every other frame shows garbage. And, the bombs are screwy looking on a frame.
Board 2: The background sprites blink and flash and often get replaced with a solid colored rectangle
Do you know what board in the stack would cause each of the above? I was thinking I could combine both boards to make a perfect working one but am not sure what combination I should be using. Or, could this be something else?
I have reseated chips, harnesses, etc.
I am using the high score save kit. If I remove it, I have the same issue. So, it's not the ROMs as these are replaced by the high score save kit. And, if I put the original roms back in I have the same issue.
I am using a switcher kit. I am getting a perfect 5V out of the switcher. I also tried it at +5.1v. Same issue.
Thanks!
