transferred management of the system in North America to a new joint venture called Turbo Technologies Inc. and released the TurboDuo, an all-in-one unit that included the CD-ROM drive built in. However the North American console gaming market continued to be dominated by the Genesis and Super NES, which was released in North America in August 1991. In May 1994 Turbo Technologies announced that it was dropping support for the Duo, though it would continue to offer repairs for existing units and provide ongoing software releases through independent companies in the U.S. and Canada. In Japan, NEC had sold a total of PC Engine units and CD-ROM² units . This adds up to a total of more than PC Engine/TurboGrafx-16 units sold in Japan and the United States , and CD-ROM² units sold in Japan. The final licensed release for the PC Engine was Dead of the Brain Part 1 & 2 on June 3, 1999, on the Super CD-ROM² format. Add-ons TurboGrafx-CD/CD-ROM² The CD-ROM² 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.) The PC Engine CD-ROM2 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