When an emulator (such as ePSXe, DuckStation, or RetroArch’s PCSX-ReARMed) runs without a legitimate BIOS file, it cannot rely on those original Sony routines. Instead, it must use a technique called . In HLE, the emulator attempts to re-create the effects of the BIOS functions through its own software code, bypassing the need for the original firmware. On the surface, this seems efficient. Many games will boot, show a logo, and even run. But the devil is in the details.
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The error message indicates that your emulator is currently using High-Level Emulation (HLE) instead of real system firmware. While HLE allows many games to run without extra files, it often leads to compatibility issues, such as broken memory card saving, missing boot animations, and game-breaking glitches. Why You Need a BIOS When an emulator (such as ePSXe, DuckStation, or
How to resolve it (recommended steps)
While many modern emulators (like those used in RetroArch, DuckStation, or handheld devices like Anbernic and Miyoo Mini) include a built-in High-Level Emulation (HLE) BIOS to let you play games immediately, this simulated BIOS has limited compatibility. Many games will suffer from glitches, broken audio, black screens, or corrupted memory card saves without an official BIOS file. On the surface, this seems efficient