# System -> folder
Playstation 1 / Duckstation -> bios/
Playstation 2 / PCSX2 -> bios/
Nintendo DS / melonDS -> bios/
Playstation 3 / RPCS3 -> Download it from https://www.playstation.com/en-us/support/hardware/ps3/system-software/
Dreamcast / RetroArch -> bios/dc
Switch / Yuzu -> bios/yuzu/firmware and bios/yuzu/keys
Those are the only mandatory bios, the rest are optional