The first system we ever had as an Atari 2600. It was my older sister's and was in her room. It never did hold my attention for long due to the repetitive arcade-style games, and I thought the graphics were terrible (the NES was out at this point).
When I was 7-years old we got an NES. Even though that was technically our 2nd system, that was the system that hooked me and made me a gamer. I started off with Super Mario Bros./Duck Hunt, The Legend of Zelda, Teenage Mutant Ninja Turtles, Star Soldier, and Pin-Bot. Great spread of games to get going on! It was a Christmas gift from my mom and Grandpa for all of us (me, my brother, and sister). Still one of the best Christmas gifts to this day, and I'm 31 years old, lol. It instilled a love of gaming in me that I have to this day.