I hooked my MiSTer up to my Sony PVM20M2MDU RGB Monitor and was pleasantly surprised how many cores worked.
Some of the cores may be slightly off center but not bad at all. My Sony PVM has a button for Overscan and Underscan that came in handy for a few of the cores.
MiSTer config setting for my setup.
My RGB cable is a VGA to BNC
If anyone is interested I recorded my results. https://docs.google.com/spreadsheets/d/ ... sp=sharing