sega_101.bin (requires specific BIOS files to boot, unlike some systems where a HLE - High Level Emulation - can work).
Because BIOS packs are extremely popular, malicious actors hide viruses inside "RetroArch BIOS Pack.exe" or "BIOS_Installer.exe". retroarch bios pack
Unlike the Game Boy Advance, the Nintendo DS requires a BIOS to boot the dual-screen interface and touch screen functions. sega_101
scph10000.bin (or others, usually placed in a subfolder). retroarch bios pack
RetroArch looks for all system firmware in a single, dedicated directory called the "system" folder. Launch . Navigate to Settings > Directory .
Load the specific core you want to check (e.g., Sony - PlayStation (PCSX ReARMed) ). Go to > Core Information . Scroll down to the Firmware section.