Atari 2600

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For the first year of production, the Video Computer System was manufactured in Sunnyvale, California. The consoles manufactured there had thick plastic molding around the sides and bottom. These added weight to the console, and because all six switches were on the front, these consoles were nicknamed "Heavy Sixers". After this first year, production moved to Hong Kong, and the consoles manufactured there had thinner plastic molding. In 1978, only 550,000 units from a production run of 800,000 were sold, requiring further financial support from Warner to cover losses. This led directly to the disagreements that caused founder Nolan Bushnell to leave the company in 1978. Despite Bushnell's retirement in 1978, Warren Robinett's invention of the first action-adventure game, Adventure, was developed the same year and changed the fundamentals of gaming as it unlocked a game with a "virtual space bigger than the screen". Once the public realized it was possible to play video games other than Pong, and programmers learned how to push its hardware's capabilities, the VCS gained popularity. By this point, Fairchild had given up, thinking video games were a passing fad, thereby handing the entire quickly growing market to Atari. By 1979, the VCS was the best-selling Christmas gift (and console), due to its exclusive content, and 1 million units were sold that year.