Enhancing PS1 Emulation with the PSXONPSP660.bin BIOS If you are looking to to improve your PlayStation 1 (PSX) emulation, you are after what is widely considered the most optimized BIOS available. This specific file is the PSX BIOS extracted from the Sony PSP Firmware 6.60 , where Sony updated and refined the original hardware's code for better performance on mobile devices. What is PSXONPSP660.bin?

Most modern emulators, including RetroArch (Beetle PSX, PCSX ReARMed) and OnionOS , support this BIOS.

Patched by Sony to work with games that sometimes struggle on standard BIOS versions.