Yes, when I put the histories of the two systems side-by-side, that was
my impression also. It does seem that the unix team can be credited
with first coming up with the idea of a portable OS.

On Sat, 2024-08-10 at 13:40 +0200, Johan Helsingius via Dng wrote:
> On 10/08/2024 13:32, Peter Duffy wrote:
>
> > (BTW - I've been trying to figure out which came first - unix, or
> > the
> > other "portable" OS, CP/M. As far as I can make out, unix preceded
> > CP/M
> > by about 4 years.)
>
> Yes, the first version of UNIX was written in 1969 (but only named
> UNIX in 1970), while the initial release of CP/M was in 1974, but
> we have to remember that in the beginning UNIX was an internal
> project within Bell Labs, it wasn't presented to the outside world
> until 1973.
>
>         Julf
>
>
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