Works, thanks!
Another question: Shader scaling works differently than Retroarch. Retroarch, by default, does this:
Source -> Shade and Scale -> Display
This is what I want, but I can't figure out how to do it in Altirra.
In Altirra, by default it does:
Source -> Shade -> Scale -> Display
Playing with the .cgp scale_ options, I can get:
Source -> Scale -> Shade -> Display
But neither of these works for me. How do I shade and scale in the same operation?