Demul Mpr- 21931. Ic501

: It acts as the "Boot ROM" that the console (or emulator) reads first to load the operating environment before a game disc is launched . Troubleshooting the Demul "Missing BIOS" Error

If you are seeing a blog post or forum thread about this, it likely addresses the common setup hurdle where Demul fails to start because it cannot find this file. demul mpr- 21931. ic501