for anyone wondering, i have no clue WTF a bios file is. all I know are rom, emulator, and savestate >_>[/list]
I assume you've used a real GBA before. See the intro screen that appears when you load any game? (The one with the GBA logo in rainbow colors?) That screen is provided by a special file in the main ROM area of the GBA console that validates the games used. It's called the BIOS file (or, in computer terms, "booting file"). Since most games nowadays are tested by the BIOS, and tend to screw up sometimes without it, people ripped an actual BIOS from a console, and saved it as a VBA compatible file, so the VBA could work exactly as a real GBA. Hope that helps. :)