The first PC I was exposured too. At the begining I was just playing games, but then I learned about BASIC and was intrigued enough to start typing the sample source codes which was listed in popular sience magazines.But when I run a simple pong game which was written as 2 player game and decided to make my first AI to play against me which at my first attempt got so perfect that I got not chance to win and then slowed it's reactions so I can actually enjoy playing against it and win some times... well that's the moment I got really hooked.