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[[Image:Sega-CD-Model2.jpg|230px]]|caption = Model 1 Sega CD & Model 1 Sega Genesis <br\>Model 2 Sega CD & Model 2 Sega Genesis}}The Sega Mega-CD (メガCD Mega Shī Dī) (released as the Sega CD in North America) is an add-on device for the [[Sega Mega Drive/Genesis]] video game console, designed and produced by Sega. The device adds a CD-ROM drive to the console, allowing the user to play CD-based games and providing additional hardware functionality. It can also play audio CDs and CD+G discs. The first version of the Mega-CD sits underneath the Mega Drive console and loads CDs via a motorized tray. A second version places a top-loading CD-ROM drive to the right of the console and is intended primarily for use with the redesigned Mega Drive II. Both versions of the Mega-CD are compatible with the initial two versions of the Mega Drive console, but not with the Genesis 3. There is also a Mega-CD module, used as an add-on device available for the [[Pioneer LaserActive]] system.

   ===Models=== *Mega-CD I (Sega CD I in North America)*Mega-CD II (Sega CD II in North America). Designed for the Mega Drive 2/2nd model Genesis (also compatible with the Mega Drive/1st model Genesis and included a special add-on for this purpose) and to reduce manufacturing costs.*Victor Wondermega RG M2*JVC Wondermega RG M1 (released on April 1, 1992 only in Japan): combination Mega Drive/Mega-CD player with enhanced sound, video and karaoke capabilities and a mechanized CD tray lid. Also included MIDI functionality. Sega themselves released on April 24, 1992 a variation of this unit with slight cosmetic changes, but functionality remains identical, branded as Sega Wondermega)*JVC Wondermega Model RG M2 (JAPAN-ONLY[[File: a second model with a different case design and wireless controller functionality built in. The mechanized CD tray was omitted in favor of a more conventional spring-loaded tray design. Otherwise, functionally identical to the Wondermega I. This model was stripped down released in the US as the X'Eye.)*Sega Multi-Mega (called Sega CDX in North America). A portable CD player that plays both Mega Drive and Mega-CD games, as well as audio CDs, and CD-G discs. Resembling a slightly longer version of the typical portable CD player of the daySega_CD_mainboard.*Pioneer LaserActive Sega Mega-CD module, an add-on device available for the LaserActive systemjpg|230px|left]]