The Atari Video Computer System (renamed the Atari 2600 in late 1982) was not the first home system with swappable game cartridges, but by the early 1980s it was the most popular second-generation console by a wide margin. Launched in 1977 just ahead of the collapse of the market for home "Pong" console clones, the Atari VCS experienced modest sales for its first few years. In 1980, Atari's licensed version of "Space Invaders" from Taito became the console's killer application; sales of the VCS quadrupled, and the game was the first title to sell more than a million copies. Spurred by the success of the Atari VCS, other consoles were introduced, both from Atari and other companies: Odyssey², Intellivision, ColecoVision, Atari 5200, and Vectrex. Notably, Coleco sold an add-on allowing Atari VCS games to be played on its ColecoVision, as well as bundling the console with a licensed home version of Nintendo's arcade hit "Donkey Kong". In 1982, the ColecoVision held roughly 17% of the hardware market, compared to Atari VCS's 58%. This was the first real threat to Atari's dominance of the home console market.