[TUHS] First Unix-like OSes not derived from AT&T code?

[Michael Huff]

 I realize this doesn't help but there's an old story about dmr being asked
in the early or mid 80's to look at a clone which he checked for specific
bugs he was aware of (but apparently no one else was). It turned out to be
clean. I don't remember the details but that might be a good starting
point?

Apologies to Andrew who gets this mail twice (in his in his private
mailbox, and on the list). I assumed gmail would send it to the list as I
intended but it didn't, so I had to resend. Sorry!

On Sun, May 1, 2022 at 1:34 AM Andrew Warkentin <andreww591 at gmail.com>
wrote:

> What was the first "clone" functional Unix (i.e. an OS not derived
> from genetic Unix code but highly compatible with genetic Unix)? Idris
> is the earliest such OS of which I am aware (at least AFAIK it's not a
> genetic Unix), but was it actually the first? Similarly, which was the
> first "outer Unix-like" system (i.e. one with strong Unix influence
> but significantly incompatible with functional Unix)? Off the top of
> my head the earliest such system I can think of is Thoth (which
> predates Idris by almost 2 years), but again I'm not sure if it was
> actually the first.
>
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