@soundmanx2 To find out all systems that need BIOS, read the Wiki:
https://github.com/recalbox/recalbox-os/wiki/Add-system-bios-(EN)
Inside each emulator folder, there is a .txt file that tells you the correct ROMS format and tells you if you need a BIOS.
About SNES ... have you tried changing the emulator / emulation core?