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My Robotron bit the dust and I need some help. The CPU gets hot to the touch, and the monitor displays the attached image. I tried swapping it with a known good CPU chip, and still the same. What should I do?
Power supply is good, I have the board set up with a switcher, along with a 4164 RAM upgrade, the 2 most common issues with Williams games.
Quick question, would not having a sound board installed currently cause any issues? I have always had the sound board in but I just took it out to test in another machine and haven't had a chance to put it back in yet.
I have activity on the address and data lines. The watchdog is pulsing away like crazy. I do have clock on pins 34-35. I put a known good ROM board in it and it didn't work so it doesn't seem like it is the ribbon cable, as I then put that ROM board back into another game and it works fine.
I don't nomally see a crosshatch pattern unless the video output addressing is hosed. If the CPU is bad or the watchdog is not getting reset (resulting in pulsing on the RESET (pin 37) line) the video is normally either all white or a set of wide vertical bars, usually green or yellow.
Crimping the ROM cable might help. You can see if you get a different result by pressing on the top of the ROM cable connector or wiggling the ribbon cable after pressing the reset button on the MPU board.
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