Amiga, which is a PC actually. It was bought for my sister around the time I was born (1988). It's the first platform I've played games on. After that I've had several PC's. The first time I personally chose all the components and other parts and assembled it, I was 13 I think.
Never had a console though.
Oh, and the first games I've played on Amiga were:
The Great Giana Sisters
Italy 1990
Terry's Big Adventure
Rick Dangerous (I and II)
Rainbow Islands
California Games
North & South
It must've been one of those. Anyways, I've played each of them, and a few other titles, quite a lot.