Prototype GBA BIOS

No clue where I picked this up, but it's definitely strange. In addition to the changed sound, using this BIOS causes minor graphics corruption in some game

Prototypes by system/Game Boy Advance - Hidden Palace

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Prototypes by system/Game Boy Advance - Hidden Palace

GBATEK - sabia

Altered GBA BIOS ? - The Independent Video Game

Video game console emulator - Wikipedia

Nintendo GameCube Prototype From Space World 2000 Expo is

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Nintendo DS Firmware 'Prototype' Reveals System's Unique Boot Up

Dolphin Emulator - mGBA Integration: Introducing the Integrated GBA

gbatek-gbaonly/index.md at gh-pages · rust-console/gbatek-gbaonly

Proto:Game Boy Advance BIOS - The Cutting Room Floor