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If you use the input test utility core, you can check for "phantom" button activations. Just press each button rapidly, or use stick/button combinations, and you may see buttons light up that you haven't pressed. This is what I've encountered.

Yeah, I'm the Jamma harness guy. :) I was using a new harness, but it seems to have had a manufacturing defect. Wound up building my own harness, and now colors look fantastic! Thanks for the support!

Thank you. Unfortunately, no access to another cab at the moment. I did try connecting to VGA monitor and all colors look great. So, the issue seems limited to the Jamma output.

Thanks for the advice. Tested continuity on RGB and ground pins and all good there. Disassembled Mistercade and checked all pins. They all seem aligned, nothing bent or broken. Tested with another K7000 monitor and same issue. Also, works good with my MVS board, no color issues. I'm at a...

Just received my new Mistercade (V1.2) and I'm getting weird colors on red and green. It's producing almost yellow on red output. Same effect running any core. I'm using a K7000 arcade monitor and a new Jamma harness. No color issues when running MVS two slot board (Jnx Jamma adapter). Any...