Good old VIC-20. The device which started it all for me. Didn't have much fun of it tho, the C64 followed quickly.
I obviously was a nerd as I managed, as a kid, to get the C64 connected. :D
My old man still has that one in the attic. Sadly enough it's a second generation C64. Then that was a good thing since it meant it also worked with non Commodore screens and even color screens. Pretty sure he could still get some bucks for it on eBay. That and the Magnavox.
My first use of a computer was on green paddles playing Pong. I must have been 4ish? The first actual computer I used was a C64 of a friend's and then a bit later an Amstrad that had King's Quest on it and it would take me ages just to get down some crappy mountain. The first I owned was an Amiga 500 with a Ram upgrade.
I have been pretty much computer illiterate most of my life - I was good at sports though :D