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