Without a proper BIOS file, many emulators can still run some games using high-level emulation (HLE), but you will encounter:
As Sony refined the console, the internal software evolved. The comes from a later hardware revision (often colloquially associated with the SCPH-7000/7500 series internals in some regions, but distinct in version numbering). Without a proper BIOS file, many emulators can
: Similarly, this could be a BIOS file, possibly for a different region or version of the PlayStation. Without a proper BIOS file
: Dump the BIOS from your own console. This requires: this could be a BIOS file
Without the exact BIOS file matching the emulated console region and revision, even the best emulators like DuckStation, ePSXe, or PCSX-Reloaded will refuse to run commercial games.
: Extracted from the PlayStation Portable (PSP) firmware 6.60.