Every apple 2 game I try, the emulator starts but I get a screen full of '@''s.
Also I then can't exit the emulator and need to reboot.
There is nothing in the readme about a bios file, but I added Rom1 for apple 2 anyway. I had similar issue with batocera and this file fixed it, but did nothing in recalbox.
Running on a Pi400 4gb memory.