Delta Emulator uses the following ds bios files zip on : DS Bios Files and Firmware: BIOS7.bin: Emulates the ARM7 processor for basic system functions. BIOS9.bin: Emulates the ARM9 processor for game logic and graphics. Firmware.bin: Manages the boot-up and hardware functions of the Nintendo DS. Save Files: Store your game progress and save states. ROM Files: These are the game files (e.g., .nds, .gba) that Delta uses to run games.