A.K.A. - TurboGrafx-16 CD
NEC made gaming history in 1989 by releasing the first CD add-on for a gaming console. The CD-ROM2 would plug into NEC's popular PC Engine console and give developers the option to create games using the larger storage space of CDs. The combination was a hit in Japan, but would meet a different fate in the U.S. The TurboGrafx-16, the American version of the PC Engine, managed to sell fairly well early on. But at $400 the Turbo CD, the U.S. equivalent of a CD-ROM2, flopped hard.
In 1997, a full ten years after the introduction of the original PC Engine, support for the Engine and Duo units finally died.