@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?
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GBA-emu and SNES-emu won't start
Emulator Arcade/PC/Console • 28 Apr 2019, 11:45 • SoundManX2 29 Apr 2019, 21:43