If you are running a multi-emulator front-end (RetroArch, LaunchBox) or a standalone emulator (DuckStation, ePSXe, Xebra), having the correct scph5502.bin is critical.
This guide explains how to set up the (v3.0 Europe) BIOS, which is essential firmware for running PAL-region PlayStation 1 games on modern emulators. 1. Understanding the SCPH-5502 BIOS
