I have no clue, but I'd assume they don't bother designing monitors to run lower than 640x480 anymore, especially with LCDs. My first instinct would be driver/gpu issue, but I have a feeling it's a monitor issue, maybe even both.
It's been over 10 years since I've played any apps full screen lower than 800x600. And probably over 15 years since I've seen anything that has a 512 resolution. I just run old apps with an emulator in windowed mode with scalers.
That's one reason I still use my CRT. CRTs are more versatile when it comes to multiple resolutions. LCDs are designed to run a specific native resolution.
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