The files you need depend on the region of the games you want to play, though some emulators are region-free with a single BIOS.
: While technically unofficial, BIOS files are often found on the Internet Archive . How to Install the BIOS Stáhnout PSX Bios – Playstation PS1 Bios (SCPH1...
: A newer method involves extracting PS1 BIOS files from official Sony PlayStation 3 system updates using tools like the Firmware BIOS Claim tool and RPCS3 . The files you need depend on the region
: The original North American BIOS; widely used for its stability and high compatibility. Stáhnout PSX Bios – Playstation PS1 Bios (SCPH1...