Description
A replacement or additional 28-Pin BIOS for the Sega Master System which will fit some models of Master System 1 & 2. This can be programmes with a Japanese BIOS to work with my BIOS support mod kits to switch to a Japanese mode when piggybacked on the native BIOS chip, or it can be programmed with the Master System boot loader.
More details and availability coming very soon.
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