If you don’t own a PSP and have no means to dump your own BIOS, you face a moral and legal gray area. Many people choose to source the file from the internet anyway, but you do so at your own risk.
Assuming you have obtained the file (legally or otherwise), here’s how to put it to work. psxonpsp660bin bios
Modern multi-system emulators like (using the PCSX-ReARMed core) or PPSSPP (the standalone PSP emulator) have a unique feature: they can run PS1 games through the PSP’s emulation layer. If you don’t own a PSP and have
Unlike traditional hardware BIOS files locked to Japan (SCPH1000), North America (SCPH1001), or Europe (SCPH1002), this file supports games from any region. That emulator required a copy of the PS1 BIOS
Sony included a built-in, high-compatibility software emulator for PS1 games inside the PSP’s firmware. That emulator required a copy of the PS1 BIOS. The psxonpsp660.bin file is that exact BIOS dump.
This is a plugin for PSPs running Custom Firmware.