It's the CMU micro kernel. The hybrid "2.6" lived on in NeXTSTEP, and OPENSTEP, with various upgrades to bring it up to OS X. The RT as I understand it was a research machine, hence the BSD ports, and Mach port. What is interesting the more I dig around is that there was ROMP coprocoessor cards, and an OS/2 and DOS monitor program to let you boot BSD on the card. Peripheral IO was done on the x86 side. If RT's are rare, I can't imagine how impossible it would be to get one of those cards! The BSD assembler and linker source is in the archives too, no doubt it'll help someone make a RT emulator. Get Outlook for Android <https://aka.ms/ghei36> On Tue, Feb 18, 2020 at 12:54 PM +0800, "Kevin Bowling" < kevin.bowling(a)kev009.com&gt; wrote: Can you clarify what is Mach in this archive if I have a gap in my > knowledge? I didn’t know the VRM had any direct relationship to Mach > > Regards, > Kevin > > On Mon, Feb 17, 2020 at 9:43 PM Jason Stevens < > jsteve(a)superglobalmegacorp.com&gt; wrote: > >> Interesting stuff! And another version of Mach is buried in there. >> >> So the 4 csrg cd set may have updates to the romp support as it's an >> older version of the 5.1 kernel from 89... Not that think there is any >> Mach romp users. >> >> Get Outlook for Android <https://aka.ms/ghei36> >> >> ------------------------------ >> *From:* TUHS &lt;tuhs-bounces(a)minnie.tuhs.org&gt; on behalf of Charles H >> Sauer &lt;sauer(a)technologists.com&gt; >> *Sent:* Tuesday, February 18, 2020, 5:51 a.m. >> *To:* TUHS >> *Subject:* [TUHS] Bitsavers' RT/PC, AIX, AOS, etc. recent additions >> >> The Bitsavers' RSS feed ( >> http://user.xmission.com/~legalize/vintage/bitsavers-bits.xml) seemed >> to me to be dominated by RT, AIX, AOS (BSD for RT), etc. stuff in the last >> week or so. I've only sampled a few items, but discovered a few things that >> I should have known (or knew and forgot?) while I was at IBM. >> http://www.bitsavers.org/pdf/ibm/pc/rt/ -- voice: +1.512.784.7526 >> e-mail: sauer(a)technologists.com fax: +1.512.346.5240 Web: https://technologists.com/sauer/ >> Facebook/Google/Skype/Twitter >> <https://technologists.com/sauer/Facebook/Google/Skype/Twitter>: >> CharlesHSauer >> >

Oh sure! I'm having to use my phone... It's the combined sources here: http://bitsavers.trailing-edge.com/bits/IBM/RT/rt_bsd44/ doc mk jsteve@localhost:~/rt_bsd4/src/sys/.local/mach2.4$ pwd /home/jsteve/rt_bsd4/src/sys/.local/mach2.4 jsteve@localhost:~/rt_bsd4/src/sys/.local/mach2.4/mk/conf$ cat vers* 69 5 1 X So 5.1x edit 69 jsteve@localhost:~/rt_bsd4/src/sys/.local/mach2.4/mk$ more CHANGELOG HISTORY 17-May-88 David Golub (dbg) at Carnegie-Mellon University XM21: David Black completely rewrote the accurate timing code (which is now implemented on all machines) and the priority and scheduling algorithms. The system now correctly reports cpu_usage per thread. The all file has this before i386 was added. So it's an older v2 than what is on the CSRG CD, but not as old as the VAX '86 stuff. It seems to be March 11 1989, although that could be when this was either archived or ported.. I guess they didn't exactly sync to a public kernel tree all that often. On Tue, Feb 18, 2020 at 4:05 PM +0800, "Kevin Bowling" < kevin.bowling(a)kev009.com&gt; wrote: I’m asking exactly where the Mach is in the linked archive. VRM, AIX or > AOS? Can you support this with a reference for my own documentation > > On Tue, Feb 18, 2020 at 1:02 AM Jason Stevens < > jsteve(a)superglobalmegacorp.com&gt; wrote: > >> It's the CMU micro kernel. The hybrid "2.6" lived on in NeXTSTEP, and >> OPENSTEP, with various upgrades to bring it up to OS X. >> >> The RT as I understand it was a research machine, hence the BSD ports, >> and Mach port. >> >> What is interesting the more I dig around is that there was ROMP >> coprocoessor cards, and an OS/2 and DOS monitor program to let you boot BSD >> on the card. Peripheral IO was done on the x86 side. >> >> If RT's are rare, I can't imagine how impossible it would be to get one >> of those cards! >> >> The BSD assembler and linker source is in the archives too, no doubt >> it'll help someone make a RT emulator. >> >> Get Outlook for Android <https://aka.ms/ghei36> >> >> >> >> On Tue, Feb 18, 2020 at 12:54 PM +0800, "Kevin Bowling" < >> kevin.bowling(a)kev009.com&gt; wrote: >> >> Can you clarify what is Mach in this archive if I have a gap in my >>> knowledge? I didn’t know the VRM had any direct relationship to Mach >>> >>> Regards, >>> Kevin >>> >>> On Mon, Feb 17, 2020 at 9:43 PM Jason Stevens < >>> jsteve(a)superglobalmegacorp.com&gt; wrote: >>> >>>> Interesting stuff! And another version of Mach is buried in there. >>>> >>>> So the 4 csrg cd set may have updates to the romp support as it's an >>>> older version of the 5.1 kernel from 89... Not that think there is any >>>> Mach romp users. >>>> >>>> Get Outlook for Android <https://aka.ms/ghei36> >>>> >>>> ------------------------------ >>>> *From:* TUHS &lt;tuhs-bounces(a)minnie.tuhs.org&gt; on behalf of Charles H >>>> Sauer &lt;sauer(a)technologists.com&gt; >>>> *Sent:* Tuesday, February 18, 2020, 5:51 a.m. >>>> *To:* TUHS >>>> *Subject:* [TUHS] Bitsavers' RT/PC, AIX, AOS, etc. recent additions >>>> >>>> The Bitsavers' RSS feed ( >>>> http://user.xmission.com/~legalize/vintage/bitsavers-bits.xml) seemed >>>> to me to be dominated by RT, AIX, AOS (BSD for RT), etc. stuff in the last >>>> week or so. I've only sampled a few items, but discovered a few things that >>>> I should have known (or knew and forgot?) while I was at IBM. >>>> http://www.bitsavers.org/pdf/ibm/pc/rt/ -- voice: +1.512.784.7526 >>>> e-mail: sauer(a)technologists.com fax: +1.512.346.5240 Web: https://technologists.com/sauer/ >>>> Facebook/Google/Skype/Twitter >>>> <https://technologists.com/sauer/Facebook/Google/Skype/Twitter>: >>>> CharlesHSauer >>>> >>>

Can you clarify what is Mach in this archive if I have a gap in my knowledge? I didn’t know the VRM had any direct relationship to Mach