Place files in RetroArch/system/dc/ .
The BIOS (Basic Input/Output System) is the essential software embedded in the Dreamcast’s hardware. It handles the initial boot sequence, the iconic swirling orange logo animation, and the system menu where you manage memory cards (VMUs). sega dreamcast bios files work
The flash memory file (stores system settings like time, date, and language). 2. Where to Find BIOS Files Place files in RetroArch/system/dc/