Great thread. Interesting how you separate the 2nd, 3rd and 4th generations different than the typical listings but I would definitely include Intellivision with Gen 2 not Gen 3. It actually released in 1979 (two years after the 2600, three years before your other Gen 3 consoles) and its tech, while better than the 2600, was noticeably eclipsed by the 5200 and Colecovision.