Sega cd bios download3/16/2024 This will be covered in a separate guide. You will need to remove the original Mega CD BIOS chip and install a socket in its place. It's important to mask off the area with Kapton tape before tinning and soldering. Pin 8 = Inverted Video Rate (to MultiBIOS Pin 39).Pin 10 = Inverted Language (to MultiBIOS Pin 38).Pin 8 = Inverted Language (to MultiBIOS Pin 38).Pin 10 = Inverted Video Rate (to MultiBIOS Pin 39).Pin 9 = Video Rate (to MultiBIOS Pin 38).Pin 10 = Language (to MultiBIOS Pin 39).Each one requires different pins routing to the MultiBIOS. Your Mega Drive may have one of the following switchless mod chips installed. It just requires swapping the wires going from the switchless chip to the MultiBIOS which will reverse Bank 2 and Bank 3 of the MultiBIOS. Universal order MultiBIOS is named such because it will work with both standard and inverted video and language outputs. The switchless mods with inverted outputs have reversed bank select wires when compared to switchless mods without inverted outputs. Pay close attention to the pins that need connecting to the MultiBIOS. These signals will control the Bank Select of the MultiBIOS. Two wires need routing from the switchless chip to the expansion port on the Mega Drive.
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