If your display is a TV or not a bottom-end PC monitor, then you should have some aspect ratio controls; just configure your display to show the image as 4:3.
If your display doesn’t have aspect ratio controls, then your options are limited. The OSSC cannot scale (line multiplication only) and does not have wide support for windowboxing, so, if this is the case, you would need an additional video processor between the OSSC and your display to force a 4:3 aspect ratio.
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