Psxonpsp660.bin Scph101.bin - Scph7001.bin Scph5501.bin Scph1001.bin !!top!!

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These files act as the console's "operating system" and are specific to different regions or hardware versions: Called HLE BIOS , these aim to run

Projects like (formerly MAME’s PSX core) and PCSX-Redux are attempting to reverse-engineer a clean-room open-source BIOS replacement. Called HLE BIOS , these aim to run commercial games without any Sony code. While impressive progress has been made, compatibility remains around 60–70% compared to 99.9% with a real BIOS file. | BIOS File | Boot Speed | Audio

: A later North American (USA) BIOS often used as a standard for later hardware revisions.

| BIOS File | Boot Speed | Audio Accuracy | Late-Game (1999+) | Region-Free | Cheat Compatibility | |-----------|------------|----------------|-------------------|-------------|----------------------| | scph1001.bin | Slowest | Good | Poor | No | Excellent | | scph5501.bin | Medium | Very Good | Good | No | Excellent | | scph7001.bin | Medium | Excellent | Very Good | No | Excellent | | scph101.bin | Medium (PAL) | Very Good | Good (PAL only) | No | Good | | psxonpsp660.bin | Fastest | Excellent | Excellent | Yes | Limited |