Hate to admit it, but I was around working on computers with the original Bell Labs Unix, System V, and all of that. And as I said in the post, both the Apple and the IBM PC were predated by other computers. (Had a C/PM Kaypro). You are leaving out the earlier kit computers which some had very rudimentary software and homebuilt machines.
Never heard the term "miniframe", but did use minicomputers, including the IBM Series I. Also used Altos machines which used Xenix, Microsofts version on Berkeley Shell Unix. I also used Visicalc on an Apple II, but I must confess I was older than 10. We also had a couple of Osbornes (sp?) at the office.
I also have several books on the early days, including "Hackers: Heroes of the Computer Revolution", which I guess I should have cited in my post. Could also go into some history on DEC machines, but I'm not sure the statute of limitations is up on all the escapades.