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| US Logo |

| European logo |
Mega CD European Bios Model 1 Version 1.00 Mega CD European Bios Model 2 Version 2.00

| European Version 1.00 |

| European Version 2.00 |
US Sega CD Bios Model 1 Version 1.00 US Sega CD Bios Model 2 Version 2.00

| US Version 1.10 |

| US Version 2.00 |
Mega CD Japanese Bios Model 1 Version 1.00 Mega CD Japanese Bios Model 2 Version 2.00

| Japanese Version 1.00 |

| Japanese Version 2.xx |

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