Someone more knowledgeable can correct me, but I expect the OSSC would digitize these resolutions just fine; however, I’m not sure that the 512×384 or 400×300 modes would be recognized by your monitor. The OSSC might be able to line-double 512×384 to 1024×768, but 400×300 is more of an oddball.
I have an old PC in the garage that I could test your use case with. What version(s) of DOS are you running, and which games?
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