Each of these processors needs its own startup firmware to function. This firmware is stored in the console's BIOS chips.
Here’s a technical write-up on , structured for someone familiar with Nintendo 3DS low-level system software or reverse engineering.
While Delta supports many consoles natively, the Nintendo DS core (often based on melonDS) requires external "BIOS" and firmware files to function due to copyright reasons; the emulator cannot legally include these proprietary Nintendo files. Without them, you will likely encounter a "Missing Required DS Files" error when trying to launch a DS game. Key Files for DS Emulation
If you see a "BIOS7 BIN Delta" error, don't panic. It usually means one of two things: