First gen - Too early for me
Second gen - Atari 2600
Third gen - Sega master
Fourth gen - SNES
Fifth gen - PS1
Sixth gen - PS2
Seventh gen - PS3
Eighth gen - PS4
For definition purposes (according to wiki anyhow) :
The first generation of video game consoles began with the release of the Magnavox Odyssey, the first commercial home video game console, was released in May 1972. This generation came to an end when Nintendo discontinued the Color TV-Game series in 1980.
The second generation of video game consoles began when the Fairchild Channel F was released in May 1976. This generation came to an end when Atari discontinued the Atari 2600 on January 1, 1992.
The third generation of video game consoles began with both Sega and Nintendo releasing SG-1000 and Nintendo Entertainment System (known in Japan as the Family Computer), respectively, on July 15, 1983 in Japan. This generation came to an end when Nintendo discontinued the Nintendo Entertainment System on September 25, 2003 in Japan.
The fourth generation of video game consoles began when the TurboGrafx-16 was released on October 30, 1987. This generation came to an end when SNK discontinued the Neo Geo in 2004.
The fifth generation of video game consoles began when Panasonic released the 3DO Interactive Multiplayer on October 4, 1993. This generation came to an end when Sony discontinued the PlayStation on March 31, 2005.
The sixth generation of video game consoles began when Sega released the Dreamcast on November 27, 1998 in Japan. This generation came to an end when Sony discontinued the PlayStation 2 on January 4, 2013.
The seventh generation of video game consoles began when Microsoft released the Xbox 360 on November 22, 2005. The seventh generation is still ongoing. The first console of this generation to be discontinued was the Xbox 360 on April 20, 2016 while the PlayStation 3 and Wii remain in production.
The eighth generation of video game consoles began when Nintendo released the Wii U on November 18, 2012. This is the current generation of video game consoles. The first console of this generation to be discontinued is the Wii U, on January 31, 2017; the other major consoles from Nintendo, Microsoft and Sony remain in production.