> At any rate, thanks everyone for your help.
Non-square pixels (as far as output display) are a thing (partiuclarly for CRT based games). Most CRTs are 4:3 aspect ratio but the output resolutions of various arcade games and consoles are not always 4:3, but they are stretched to 4:3 (or there abouts, as CRTs had bezels and overscan so the aspect ratio was always likely a bit different between different CRTs/arcade operators/etc.
What you need to turn on is prescale. In addition, a higher resolution monitor also helps. Prescale scales the image up beyond it's original resolution and then scales it back down to your monitor's resolution. It's likely the best you can do for a LCD display (again, why a higher resolution display is better - the blurriness is less noticeable).
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