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

DuckStation, PCSX-ReARMed, and even standalone ePSXe recognize this BIOS and often recommend it as the best all-rounder due to fewer timing bugs. Part 3: Which Emulators Use These Files? | Emulator | Supported BIOS Files | Notes | |----------|----------------------|-------| | DuckStation | All five; prefers psxonpsp660.bin | Auto-detects region; can use multiple BIOS files per region | | ePSXe | SCPH1001, SCPH5501, SCPH7001, SCPH101 | Does not officially support psxonpsp660.bin but can use it renamed | | RetroArch (PCSX-ReARMed) | All five | Strongly recommends psxonpsp660.bin for handhelds (PSP/Vita) | | PCSX-Reloaded | SCPH1001, SCPH5501, SCPH7001 | Older codebase; no PSP BIOS support | | Xebra | SCPH1001 only | Extreme accuracy, but picky |

Introduction In the world of video game emulation, few subjects are as misunderstood—yet as critically important—as BIOS files. For Sony PlayStation (PS1) emulation, a collection of specific filenames forms the backbone of compatibility, accuracy, and performance. If you have ever searched for terms like psxonpsp660.bin , scph101.bin , scph7001.bin , scph5501.bin , or scph1001.bin , you are likely deep into configuring emulators such as DuckStation, ePSXe, PCSX-Reloaded, or RetroArch. For Sony PlayStation (PS1) emulation, a collection of

| 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 | For Sony PlayStation (PS1) emulation