I didn't actually own a computer back when. I even predate most of the clickety clack models, though what were called Trash 80s (Radio Shack) models were getting popular, along with similar other inventions.
Mainframes were what I learned on. No GUI interface, just command-driven, so I learned a bunch of operating systems, and as this sort of thing evolved, I wrote dozens and dozens of user manuals for various OS, such as VAX/VMS, Unix, X-Windows, etc.