Psxonpsp660.bin: Retroarch Better

Safer, documented fallback behavior

: Originally extracted from the PSP's PS1 firmware, it has high compatibility with almost the entire PS1 library. Psxonpsp660.bin Retroarch BETTER

Copy the renamed file into that directory. No subfolders. Enhanced UI for BIOS management It’s still proprietary

Enhanced UI for BIOS management

It’s still proprietary code, not open source, and not a true “performance upgrade” – just a compatibility polish. But for 99% of RetroArch users, Psxonpsp660.bin is indeed the better daily driver BIOS . Trade-offs Missing Boot Sequence : It is functionally

: It includes software patches and improvements from Sony that fixed issues found in earlier hardware versions, leading to better compatibility across many PSX cores. Trade-offs Missing Boot Sequence

: It is functionally region-free, meaning a single BIOS file can often handle NTSC-U, NTSC-J, and PAL games without the need for multiple files in your system folder.