Not every classic console requires a BIOS. Cartridge-based systems like the NES, SNES, Sega Genesis, and Game Boy generally work right out of the box.

Alternatively, there are open-source, reverse-engineered BIOS replacements (such as HLE BIOS for some systems) that can be legally distributed. However, these are not available for all platforms and may not offer perfect compatibility with all games.

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