Despite the confusing name (it says "PSX"), this is a PlayStation 1 BIOS. This is the PlayStation Portable (PSP) BIOS file version 6.60.
: Optimized by Sony specifically for emulation, often resulting in smoother gameplay on portable devices. Region Free download psxonpsp660bin top
The PSP’s hardware and software ecosystems fostered a vibrant homebrew and emulation scene. Key technical points: Despite the confusing name (it says "PSX"), this
Any discussion here must note general principles (without offering legal advice): Region Free The PSP’s hardware and software ecosystems
— You can dump your own PSP’s BIOS legally using homebrew tools (e.g., PSPident, DumpBIOS). This is the only fully legal way to obtain the file.
The file is a high-performance PlayStation 1 (PSX) BIOS extracted from the PlayStation Portable (PSP) firmware. It is widely considered the "gold standard" for PS1 emulation because it is more optimized and offers better compatibility than original console BIOS files like scph1001.bin . Why Use PSXONPSP660.bin?
— Popular emulators like PPSSPP do not need a “psxonpsp660.bin” file for PSP games; that filename is more commonly associated with PSX emulation on PSP custom firmware.