[TUHS] DG UNIX History
stuff at riddermarkfarm.ca
Tue Nov 15 11:21:19 AEST 2022
On 2022-11-14 17:31, Clem Cole wrote:
> On Mon, Nov 14, 2022 at 5:12 PM Paul Ruizendaal <pnr at planet.nl> wrote:
> Following on from the exchange on TUHS about DG-UX, it would seem
> to me that the (Unix) unified cache was invented at least three
> times for Unix:
> Not to quibble too much, but s/cache/memory/ I think is a fairer way
> of saying that.
> - John Reiser at AT&T
> - At Sun
> - At DG
> - At CMU (Mach)
> The interesting thing again, is that while they while all of these
> implementations seem to have been technologically 'better' - only Mach
> lived on from the original developers. And in the case of Mach, by
> the time it was mainstream (macOS) the original implementation had
> been replaced a few times - so while the concepts are there, I don't
> think much of the Original CMU code is left in XNU/Darwin [or for that
> matter in the OSF flavors -- Tru64 rewrote it but it died and the
> OSF/RI kernel never went anywhere either].
The CMU copyrights are still there
Perhaps someone far more knowledgeable than me could spelunk.
> As I said, the lesson to TUHS -- as much as I'm a techie and I am
> interested in the 'proper' way of doing things ... "good enough" is
> often what rules.
> It's too bad none of the good memory implementations made it into
> >>systems<< that lasted.
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