That could very well have been a Model 16 running Xenix 68k.

From memory, the two serial ports could run classic getty processes.

https://en.wikipedia.org/wiki/TRS-80_Model_II#model16

Yep-- that's what I was getting at. I'd love it if somebody w/ real Tandy corporate experience appeared in this thread and discussed it... >smile<

Here's hoping for the power of Hacker News.