The CD-ROM is an add-on attachment for the PC Engine that was released in Japan on December 4, 1988. The add-on allows the core versions of the console to play PC Engine games in CD-ROM format in addition to standard HuCards. This made the PC Engine the first video game console to use CD-ROM as a storage media. Moreover, the PC Engine was also the very first machine of any type, computer or game console, to offer game software on CD-ROM format. (Whereas the first CD-ROM game software on a computer was a conversion from floppy disc of Mediagenic/Activision's The Manhole for the Macintosh computer, in black & white, released December, 1989, a year after PC Engine Fighting Street, a conversion of Capcom's arcade Street Fighter, and No-Ri-Ko, an adventure/dating simulator notable for the being the first multimedia game, utilizing RedBook Audio digital speech and digitized sprite graphics.)
Engine CD-ROM add-on consisted of two devices - the CD player itself and the interface unit, which connects the CD player to the console and provides a unified power supply and output for both. It was later released as the TurboGrafx-CD in the United States in November 1989, with a remodeled interface unit in order to suit the different shape of the TurboGrafx-16 console. The TurboGrafx-CD had a launch price of $399.99 and did not include any bundled games. Fighting Street and Monster Lair were the TurboGrafx-CD launch titles; Ys Book I & II soon followed.