Enter the Optical Disc 7 of 14
The first console to actually store game code on an optical disc (and the first to use a CD-ROM drive) was the NEC PC-Engine CD-ROM2 unit , an add-on to the extant PC Engine console. (This unit became the TurboGrafx CD  in the United States.) Sega soon followed with its own CD add-on for its Genesis/Mega Drive console known as the Sega CD  in the U.S.
 RDI Halcyon (1985) & Pioneer LaserActive (1993),  NEC PC Engine CD-ROM2 (1988),  Sega CD (1991)