RetroArch has cemented itself as the "Swiss Army knife" of emulation. By unifying dozens of gaming consoles (or "cores") under a single, sleek interface, it allows gamers to play everything from Atari 2600 classics to PlayStation 2 blockbusters.
RetroArch does not look for BIOS files in the same folder as the emulator executable. It uses a specific folder called "System." retroarch bios pack
Search for reliable packs: Since these files are not legally shareable by developers, users often find complete packs on the Internet Archive or community forums. The Ultimate Guide to the RetroArch BIOS Pack:
scph5500.bin (Japan), scph5501.bin (USA), scph5502.bin (Europe).