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CDI games were a proprietary format developed by Sega, which combined the benefits of CD-ROM technology with the performance of cartridge-based games. This innovative approach allowed for larger, more complex games with rich multimedia content, including full-motion video (FMV), CD-quality audio, and interactive elements. The CDI format was used for a selection of Dreamcast titles, primarily in the late 1990s and early 2000s. dreamcast cdi collection verified
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