The Sega CD (Mega-CD in Japan) bolted a CD-ROM drive onto the Genesis in 1991 — full-motion video, CD audio, and a second processor, years before the PlayStation made discs standard. It flopped commercially, but its best games are all-timers.
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Sega CD: The Add-On That Saw the Future
In December 1991, Sega looked at the Genesis — the console currently beating Nintendo bloody in the console wars — and decided…