A BIOS (Basic Input/Output System) file is a crucial component of the PlayStation console. It contains the firmware that controls the console's hardware and provides a interface for the operating system and games to interact with the hardware. For ePSXe to work, you need a PS1 BIOS file.

| Problem | Possible Solution | | :--- | :--- | | | This is a known issue on Windows 10 and 11. Switching to a different video plugin, like a newer version of a Pete's OpenGL plugin, often resolves it. | | Controller Not Working (especially D-PAD) | Manually edit the hidden .epsxerc file in your ePSXe directory. For keyboard, set the last four keycodes to "111,114,116,113". For a controller, ensure Windows recognizes it; the issue may require using a different input plugin or legacy mode. | | Game Doesn't Load / Gets Stuck | First, try a different video plugin or BIOS. If that fails, edit the Windows Registry (regedit) and delete the ePSXe folder under HKEY_CURRENT_USER\Software . This resets all settings. | | FPS Conflicts (Audio Crackling) | Disable the "Use FPS limit" option in your GPU plugin, as the sound plugin (like ePSXe SPU core) may have its own frame limiter causing a conflict. | | Game-Specific Glitches | For major titles like Gran Turismo 2 or Metal Gear Solid , there are known "sweet spot" settings for the "Framebuffer effects" and "Off-Screen drawing" in Pete's plugins that fix specific issues. |

Pro tip: The Japanese BIOS ( scph1000.bin ) works but will display Japanese text in console menus. Stick with scph1001.bin for English-language games.

: Ensure your BIOS file ends in a .bin extension. Capital letters matter on some operating systems; ensure it is lowercase ( .bin ) rather than uppercase ( .BIN ). Missing Black Bars / Stretched Screen

Poor audio configuration results in stuttering music and delayed sound effects. Fortunately, ePSXe 1.9.0 comes pre-packaged with excellent default options. SPU (Audio) Configuration ePSXe SPU Core 1.9.0 .

In ePSXe 1.9.0, look for options relating to sub-pixel precision. Turning this on reduces the classic "polygon warping" and "texture shaking" native to original PS1 hardware. 3. Configuring Audio and Controller Plugins

While ePSXe 1.9.0 supports a wide range of regional BIOS files, the most stable and commonly cited versions are:

Drop down the top-right menu to select if you are using a modern controller with analog sticks.