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    Sega CD - Bios Rom Chip

    I'm working on modding my Mega CD 2 to play every region's game. I have put a 40pin socket where the Bios used to be, and plugged the original bios on it. I pretend to change that 128kb rom with a 512kb eprom containing all regional versions of the Sega CD Bios, but I don't know which eprom...
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