You need the file called "[BIOS] Nintendo Famicom Disk System (Japan)". It's a .bin file, though it might zipped when you find it. When you get the popup in NSUI that says "Error! Bios file for Famicom Disk System is not specified. Please configure it in options (Bios tab).", go to Tools >...
I'm trying to convert a Famicom disk game to a .cia. However, I keep getting a message that says "Error! Bios file for Famicom Disk System is not specified. Please configure it in options (Bios tab)." There are no instructions as to how to do this. The tutorial only shows how to convert a Game...