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To: Michael =?utf-8?Q?Kj=C3=B6rling?= <michael@kjorling.se>
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Michael Kj=C3=B6rling wrote:
> And all this, of course, ignoring the other issue of what might be
> considered a "start to the open source operating system movement",
> given that even development of GNU was well underway by the time the
> Linux kernel got started (having been worked on since early 1984)

GNU planned to adopt TRIX which was developed at MIT in the mid 1980s.
I don't know its exact distribution terms, but Wipikedia says "open
source" so it was possibly in that general vicinity.

Arguably ancient PDP-10 operating systems like ITS, WAITS, TENEX were
somewhat "open" and "free", but it's not a clear cut case.