: This is how old I am. These were the computers I first ever used. The Sinclair was the first. It’s how I learned BASIC, when I was 11 years old. My maternal uncle had a Tandy at home and at his office not long after that. That’s what I first began playing text-based games on. Then came along the Commodore 64.
@GaryPoole: My first mainframe used was an IBM System/38, in 1986, when I was 16. By the time I got to college in 1988, though, it was gone, and a shiny new AS/400 was in. I didn't want to futz with learning another system, and so I went full on DOS and Windows because that was the marketplace at that point.