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Nice write up by Cerf. I've heard him speak at a few conferences. We were privileged to be part of the generation that built the internet. I still have my early work with Phil Karn, KA9Q on his NET/NOS code to do TCP/IP over AX.25 on ham radio. I used the same code to drive a SLIP link to UCSD from the Xenix box. When PPP was finally ready for use, I upgraded to Xenix drivers to use PPP. I only had a 2400 bps modem at the time, so internet connectivity was slow. Tolerable for my budget in 1985.

AT&T Research UNIX

The 7th edition released in 1979 was the basis for the distribution to Microsoft and Tandy. It was the precursor to System III. The 68000 Xenix I had in August 1983 was System III flavor. It was difficult to backport the System V uucp to that version of the OS. Tandy had a later release that I installed along with the 68010 CPU to support demand paged virtual memory. That was a big improvement to the responsiveness of the OS. I'm pretty certain that the current OS on my 68010 Xenix box is a System V environment. It hasn't been booted since 2000 when I moved to Idaho, so the power supply may be in tough shape.