My dad was a computer programmer, so we had all sorts of interesting computers. The first one I remember playing extensively with was the KayPro II. It had a 5 MHz processor, and 64k of memory, which actually was pretty good for 1982. This bad boy was great - if you liked a 9" green CRT screen and text-based games. There was this one great game where you owned a business, and had to make stock deals and the like to make more money. Wish I could remember more about it, but hey, I was 4 years old. It also folded up quite nicely:
After that was our monster Atari computer, which I can't find a pic of anywhere.
My first real PC was a ca. 1987 WYSE 286 with an 8 MHz processor, 384K RAM, upgradeable to a whopping 1 MB. It took about 5 minutes to load Windows 3.1.
My dad also did some work at a nuclear power plant, experimenting with Solar power (which, contrary to what some nuts say, is completely unfeasable as a power source). They had one of those computers that took up an entire room with vacuum tubes and was programmed with punch cards. It was dubbed The Little Elephant. Apparantly the Big Elephant took up a room 3 times the size of the little one, but it was still quite a site to see.