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Proto:Sega Master System BIOS
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This page details one or more prototype versions of Sega Master System BIOS.
Two prototypes of the Master System BIOS are known to exist, both originating from demonstration units from Sega of America.
Sub-Pages
M404 Prototype The earliest available version of the BIOS, with very different logos and almost no compatibility among released games. |
v1.0 Prototype Has the finalized logos and full game compatibility, but no Snail Maze. |