While the Nintendo 64 did not match the PlayStation's sales, it kept Nintendo a key competitor in the home console market alongside Sony and Sega. As with the transition from the fourth to fifth generation, the fifth generation has a long overlap with the sixth console generation, with the PlayStation remaining in production until 2006. Handhelds of the fifth generation Nintendo released the Virtual Boy, an early attempt at virtual reality, in 1994. The unit required the player to play a game through a stereoscopic viewerfinder, which was awkward and difficult, and did not lend well to portable gaming. Nintendo instead returned to focus on incremental improvements to the Game Boy, including the Game Boy Pocket and the Game Boy Color. Sega also released the Genesis Nomad, a handheld unit that played Sega Genesis games, in 1995 in North America only. The unit had been developed through Sega of America with little oversight from Sega's main headquarters, and as Sega moved forward, the company as a whole decided to put more focus on the Sega Saturn to stay competitive and drop support for all other ongoing systems, including the Nomad. Despite Nintendo's domination of handheld console market, some competing consoles such as Neo Geo Pocket, WonderSwan, Neo Geo Pocket Color, and WonderSwan Color appeared in the late 1990s and discontinued several years later after their appearance in handheld console market. Sixth generation (1998–2013) By the sixth generation, console technology began to catch up to performance of personal computers of the time, and the use of bits as their selling point fell by the wayside. The console manufactures focused on the individual strengths of their game libraries as marketing instead. The consoles of the sixth generation saw further adoption of optical media, expanding into the DVD format for even greater data storage capacity, additional internal storage solutions to function as memory cards, as well as adding support either directly or through add-ons to connect to the Internet for online gameplay. Consoles began to move towards a convergence of features of other electronic living room devices and moving away from single-feature systems. By this point, there were only three major players in the market: Sega, Sony, and Nintendo. Sega got an early lead with the Dreamcast first released in Japan in 1998. It was the first home console to include a modem to allow players to connect to the Sega network and