I think I was 10, an Apple II+. It wasn't the first thing I used to program (I'd dabbled in LOGO and BASIC before), but it was a surprisingly complete computer

I think I was 10, an Apple II+. It wasn't the first thing I used to program (I'd dabbled in LOGO and BASIC before), but it was a surprisingly complete computer. I used it to learn about a lot of different things, such as input from peripherals like a joystick, as well as memory management -- from that damnable "out of memory" error when my overzealous BASIC programs got too big. :)