Tom,

There are some nice, tasteful diagrams that trace the history of UNIX like this from Computerworld:

http://www.computerworld.com/article/2524660/operating-systems/the-unix-family-tree.html

But they are woefully incomplete, leaving out variants that even I worked with like Digital UNIX and DG-UX.

To get a fuller picture, you need to down some ibuprofen, slap on that left-over scopolamine patch from that sailing vacation, and check this out:

http://www.levenez.com/unix/

BSD == Dapper Dan? System V == Fop? I just can't guess with any confidence.

Jim

Let's not talk about OS/2.