3/20/2021 0 Comments Sega Cd Bios
The chip selects which bank to use based on what signal it received on pins 38 and 39.The corresponding expansion port pins on the Mega CD are then routed to the pins on the MultiBIOS chip.These signals will control the Bank Select of the MultiBIOS.
Sega Cd Bios Mods With InvertedThe switchless mods with inverted outputs have reversed bank select wires when compared to switchless mods without inverted outputs.Place chip sideways onto the surface and use the surface to bend one side of the pins inwards. Do this gently and check if they align with the socket each time. A small circle indicates Pin 1 or a half circle cut indicates which side of the chip to start counting from. Also make sure that you are soldering the pins that are for the top side of both the Mega Drive and Mega CD expansion port pins. Unless you are using Borti4938 Mega Drive switchless mod which prevents the BIOS changing until a reset.
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