@tubetime I've also seen ones with a bunch of DIP switches that do the same thing, although I have no idea how they work with the more oddball (by 13W3 "standards") systems.

Now if only we had something like the retrotink that took the weird refresh rates and piped that over displayport with freesync... I have exactly _one_ VGA-capable monitor, and if the signal isn't almost exactly 60Hz it craps itself, but I also have a pair of digital-only monitors that will happily run pretty arbitrary oddball refresh rates if I can get the signal into them...