Dreamcast models made in 1999 and 2000 play self boot ISO/game discs. Version 0.
Some models made in 2001 play self boot ISO/game discs. Version 1.
No models in 2002 can play self boots. Version 2.
* However, with a Utopia boot disc, any model can play back up cds/games.
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For more info on this or to read more "how to" or "tutorials" for Sega consoles, see link below.