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The file is a PlayStation BIOS extracted from PSP firmware 6.60. It is widely considered the "solid" or optimal choice for PS1 emulation due to its enhanced performance and compatibility over traditional hardware-ripped BIOS versions. Key Features & Performance

If you want to use psxonpsp660.bin legally and safely, follow this official method.

psxonpsp660.bin is a region-free BIOS extracted from PSP firmware 6.60

The only legal method is to console that originally came with firmware 6.60 (or was updated to it). Steps include:

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