I want to add Atari800 (either the unofficial libretro core or the standalone emulator like it's done with Dosbox).

I know I have to build my own recalbox for this. I already poked around the source code and tried to figure out how the buildroot works. However, I could not figure out how the buildroot fetches the source code for the emulators and where I should make my changes.

Can anyone guide me how to get started?

For me, it makes no difference what settings it is in. It always behaves like "default". Where might I have to look to track this down?

OK, then I'll have to stick with the DOS and maybe ST versions of the Amiga games I want to play.

Thanks for investigating this. Currently, I can live with the workaround of temporarily putting a symlink to my roms folder onto my desktop since I only use the gamelist editor to edit DOS games, Category folders and clean orphans, as the former two can't be done with the manager I use for everything else because it does not handle folders as entries but descends into them.

While we are at this topic: When I do "Clean orphans" for folder based entries, all info for them is cleared, even for the existing ones. I think you check for a game being an orphan if the path it points to is a file, and since DOS games and category folders are not, your editor misleadingly thinks the entry is an orphan. You should add a check for the path being a folder for the orphan check.

I discovered that the Amiga emulation uses an older SDL1 version of Amiberry. While this works fine performance-wise, it has the known problems that screen size adjustments are not saved (bad for games that use Overscan like Oxxonian) and it has a very high audio latency (about half a second in the Action game of Oxxonian). Is it possible to use a newer build of Amiberry (one of the SDL2 ones) instead? They have much less audio latency and get the screen size right.

have the same problem. I mounted the share folder on my Mac and am running the Gamelist editor through Wine. When I select the roms folder, it also tells me this error message.

I double-checked that my ROMs folder is correct (I didn't change anything, just went with the defaults. I can edit ROMs with Recalbox Manager).

When I copy the ROMs folder over to my Mac, it works, however I can't select it from the share.

EDIT: I discovered that when I put a symlink on my desktop pointing to the network share, I can select this symlink and it works.