Good to see another former "DEC-pert" has joined the group, I remember CORE Memory, Open Real Tapes, Chain Smoking Computer Operators, and machines that used $5000+ worth of electricity every month and filled entire rooms.
First UNIX experience for me was System Two Version Seven (AT&T / Berkley) at General Electric Corporate in the Summer of 1981, running on a PDP-11/45. I wrote test specifications for just about the entire operating system at the time during my co-op experience there while I was in college.
As another note I also remember the first time I used the term "A GIG" to describe computer memory, it was back about 1983 when I was working for Remington Products in Bridgeport CT. My boss and I were talking about how much "smaller" computers where getting and how we almost a "1000 Meg" of Hard Drive space on the company computer. I also remember laughing about how silly calling it "A Gig" (short for GigaByte) sounded for the rest of the day.
The IBM personal computers that where being used around the company had memory sizes the measured in KiloBytes and eight inch floppy drives. I think that about this time some future software multi-multi-billionaire was quoted saying "Why would anyone ever need more then 64K". Maybe that is just an urban legend, and someone else said it.