: Sony patched specific issues in this BIOS to allow problematic PS1 games to run smoothly during emulation.
: It is "region-free," meaning it can boot NTSC (US/JP) and PAL (European) games without needing to switch files.
Unlike the older BIOS versions found in hardware, the PSXONPSP660.BIN offers several technical advantages:
: Because it was built for the PSP's relatively low-powered hardware, it is more efficient than original hardware BIOS files.
: The file omits unnecessary original hardware features, like the CD player and memory card manager, to focus purely on game execution. How to Find and Use It on Archive.org