I had a play with the configuration file last night but did not manage to resolve it. I did read somewhere about disabling Overscan but could not find any reference to it in the advmame cfg file. Perhaps it’s a global option? And adding it caused them emu to not load.
I will keep searching for a solution and let you know.
on my system (4:3 monitor), the game final fight has some black bars at the top/bottom of the screen. This is correct, as it due to the resolution of the game vs my screen resolution (and the aspect ratios). if it filled the screen vertically, it would look stretched.
If the game was originally meant to be more vertically stretched and displayed at 4:3, then there is no quick fix due to the modifications in the retropie version – it assumes square pixels and only offers a few scaling options. I added some workaround for games like blasteroids where you can choose a doubled y ratio to fix it. I could perhaps add some additional video ratios. Final fight looks fine though on my screen.