5 Jan
2020
5 Jan
'20
2:57 p.m.
On Sun, 2020-01-05 at 23:41 +0100, Liam Proven via cctalk wrote:
No OS X uses Mach 2.5. I worked in the kernel group at Apple for a
number of years and am fairly familiar with the kernel. They may have
pulled a few things from Mach 3.0, but it is still fundamentally
Mach 2.5.
It was, and I think only on Apple hardware. There were a few dev
builds and then it disappeared, IIRC.
[*Checkes*]
Yup, OldWorld-ROM NuBus PowerMacs, and later OldWorld PCI PowerMacs
--
but later Linux supported PCI Macs directly.
There were apparently 4 "developer releases", an R1 and an unfinished
R2. Supplanted by Mac OS X, but apparently the Mach work really
helped
to get NeXTstep and "Rhapsody" bootstrapped on PowerMacs.
--
TTFN - Guy
On Sun, 5 Jan 2020 at 23:30, Guy Sotomayor via cctalk
<cctalk at classiccmp.org> wrote:
Yea, unfortunately I've lost most of the historical documentation
starting when we were all packed up to move from Boca Raton, FL to
Austin, TX and then when I left IBM in 1997.
I still have a set of the IBM Microkernel manuals (several 1000 pages
that was all written in Framemaker) and I *may* still have a CD with
the final set of sources on it (but where that might be would be an
interesting question).
Yes. We first started with Mach 3.0 build MK58. We did our final
fork at MK68. We made some *significant* changes from what CMU
had (things like changing mach messages from IPC to RPC) and a
whole lot of work in the area of scheduling.
Very interesting. If you are allowed to, you should blog about this
somewhere -- it is historic stuff. Yes, a lot of things were based on Mach. One OS
that you're
forgetting
is OS X. That is based upon Mach 2.5.
Well, firstly, no, I wasn't. I didn't mention OS X, or macOS as it's
called now, because it's based on NeXTstep. It's a later version of
the same OS.
Secondly, AIUI, NeXTstep used Mach 2.5 but one of the changes in Mac
OS X 1.0 is that they moved to Mach 3 and updated the userland from
BSD 4.4-Lite to FreeBSD then-current, hiring Jordan Hubbard to do
much
of that work.. MkLinux
didn't get very far, either, did it?
I think that was the original Linux port for PPC.