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I don’t have much experience with arcade hardware; but, from the console side of things, I know there are a number of televisions that don’t like Line 3x/4x/5x from the OSSC, either because of the resulting resolution (Not too many TVs like 960p, for example), or because the refresh rate isn’t exactly 59.94Hz or 60Hz. In the cases of the NES and SNES, some frames are cut short by one line, which results in a jittery sync that some flat-panel televisions can’t lock onto because it’s not an exact, consistent cadence. CRTs don’t care about any of that.
In my experience, I’ve had no trouble with an Xbox, PS2, PlayStation (both original and PSone), N64 (through S-Video and an RGB decoder), NES (through composite and the same RGB decoder), nor a Dreamcast on my 32-inch Samsung LCD (LN32B360somethingorother from about 2009) using just Line2x on 240p and 480i content, and Passthrough for 480p and up, but I did not have luck with Line3x, 4x, or 5x for 240p content, nor Line2x for 480p content. I’m not sure if those modes generate a slightly nonstandard refresh rate, or if my TV just doesn’t like the resulting resolutions, or both.