: Open Demul and go to Config > Plugins and Paths . Ensure the "ROMs and BIOSes" path is pointing exactly to the folder where you placed the dc.zip file.
Let’s go deep. Based on reverse-engineered NAOMI schematics (leaked service manuals) and repair logs, here is what we know about the . demul mpr- 21931. ic501
Ensure you have the Dreamcast BIOS files (usually found in a file named dc.zip ) inside the folder you have designated as your in DEmul. 2. Rename for Compatibility : Open Demul and go to Config > Plugins and Paths
If you have a physical Sega NAOMI board with no video or distorted video, and you suspect IC501, follow this diagnostic flow. and you suspect IC501
