Consoles from 1970 to Present. A video game console is an interactive entertainment computer. The term is used to distinguish a machine designed for consumers to buy and use solely for playing video games from a personal computer.
Just posting the earliest three - check the
source for the complete list.
Magnavox Odyssey - Released in 1972
The Magnavox Odyssey is the first home video game console, predating the Atari PONG home consoles by three years. The Odyssey was designed by Ralph Baer, who had a working prototype finished by 1968. This prototype is affectionately known as the "Brown Box" to classic video game hobbyists. Unlike most video game consoles, the Odyssey is analog rather than digital, which makes its invention all the more amazing in spite of its rather crude graphics and controller responsiveness. Also, unlike any conventional console today, this system was powered by batteries. The Odyssey and its variants also lack sound capability (hence a silent console), which was not uncommon in early PONG systems of that era.
The Odyssey was released in May 1972. While it did not perform badly, it did not take long before it succumbed to poor marketing by Magnavox retail chains. One of their mistakes was misleading consumers into believing that the Odyssey would work only on Magnavox televisions. It did, however, prove that consoles for the home could be designed.
Atari PONG - Released in 1975
In 1973, after the success of the original PONG coin-op, an Atari engineer by the name of Harold Lee came up with the idea of a home PONG unit. Since the PONG coin-op that Alan Alcorn designed was nothing more than the game board connected to an actual television set, he thought it would be possible to scale it down a bit and modify it for use at home. This would be a new direction for the fledgling Atari consumer electronics. If they could pull it off, they would be one of the pioneers of using high tech custom integrated circuits in the consumer industry.
In 1975 it was decided Sears would sell PONG under it's own specially created Tele-Games label, and production was initially projected at 50,000 units. This was soon raised to 150,000 for the 1975 Christmass season. Atari agreed to give Sears exclusive rights for the following year, and would continue to make custom Tele-Games versions for any future consoles. This was the beginning of a long relationship between Atari and Sears, which would continue even after Nolan Bushnell sold Atari to Warner.
Magnavox Odyssey 100 - Released in 1975
The Odyssey 100 was an analog system which used four Texas Instruments chips. It did not use cartridges and played two games: TENNIS and HOCKEY. A simple switch selected the games, and the system was either powered by six batteries, or by an AC adaptor (such power supplies were widely used by other systems).
The Odyssey 100 was very basic and didn't have the common features of the million-seller PONG systems of the next years. The knobs were fixed: there were no detachable controllers yet. There was no digital on-screen scoring: the players marked their score using two little plastic cursors on the system. The serve couldn't be changed: it was automatic. This could seem strange compared to the first Atari PONG systems which already had digital on-screen scoring. In fact, this was just a question of technology. On-screen scoring would have required additional components, which would have increased the cost of the system. Nevertheless, on-screen scoring was added in later systems although the first attempts used archaic graphics. The first Magnavox system to offer digital on-screen was the Odyssey 300 in 1976.
Source: A History of Home Video Games from Atari to Xbox, Playstation and Wii