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: Because it is a proprietary Sony file, it isn't included with emulators like DuckStation. This adds a "tinkering" barrier for casual users who just want to play a game quickly. 4. Technical Versatility
Standard PS1 hardware BIOS files are region-locked. If you want to play a Japanese game, you generally need a Japanese BIOS. The PSP BIOS is region-free, meaning a single PSXonPSP660.bin file can boot NTSC-U (USA), NTSC-J (Japan), and PAL (Europe) region games flawlessly. 2. Enhanced Performance and Speed