The attract mode of Space Encounters. It works!
https://retro.social/system/media_attachments/files/111/473/549/261/999/343/original/f299c15a000faee2.png
In this case, I stuck the chassis back on the shelf, and a couple bolts to hold it in place, and tightened down nothing else.
And it worked perfectly the first time, and the flicker is gone.
(The monitor is B&W, the colors are from an overlay that sits on top of the monitor and gives different areas different tinting -- very common on B&W video games.)
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