An SMP Implementation - A Retrospective by James M. Flemming and Christopher A. Beute <http://www.brunschen.com/christian/VaxUnixSMP.html> may be interesting in the context.
// Christian On 7 September 2016 at 17:45, Johnny Billquist <b...@softjar.se> wrote: > The 11/782 are no more asynchronous than any multiprocessor system. > > The A in ASMP stands for assymetric. As in, the second processor did not > run any kernel code, but is a slave processor to the primary processor. It > gets scheduled with user-land code to run, but any trapping to the OS means > it interrupts the main processor, who do all the work. > > Johnny > > On 2016-09-07 18:23, Ray Jewhurst wrote: > >> I think you are like I am. I would like to see every DEC simulator >> possible. Right now I am doing some preliminary research into the >> feasibility of a VAX 11/782 which is an asynchronous dual processor >> 11/780. I will need help because I am not a real experienced coder. >> >> >> On Sep 6, 2016 8:21 PM, "khandy21yo" <khandy2...@gmail.com >> <mailto:khandy2...@gmail.com>> wrote: >> >> Just curious,. Is there any thought about emulating any of the Dec >> mate Line? I used to deal with them, mostly as wps8. I don't know >> what the hardware differences are, but I saw a large number of Dec >> mates and only a few pdp8s. How compatible were they? >> >> >> >> Sent from my Galaxy Tab® A >> >> -------- Original message -------- >> From: Ethan Dicks <ethan.di...@gmail.com >> <mailto:ethan.di...@gmail.com>> >> Date: 9/6/16 5:00 PM (GMT-07:00) >> To: simh@trailing-edge.com <mailto:simh@trailing-edge.com> >> Subject: Re: [Simh] Pdp8 terminals >> >> On Tue, Sep 6, 2016 at 1:03 PM, Johnny Billquist <b...@softjar.se >> <mailto:b...@softjar.se>> wrote: >> > Hi. >> > >> > On 2016-09-06 18:55, Bob Supnik wrote: >> >> >> >> The PDP8 simulator is more or less a PDP8/A, and its terminal >> >> "multiplexor" is a KL8-JA, which implements four discrete KL8A >> style >> >> interfaces. These are superset compatible with the PDP8/I's PT08 >> >> discrete interfaces, and thus TSS/8 will work. Note that TSS/8 >> supports >> >> only four discrete terminal interfaces. To get more than four >> lines, the >> >> configuration must have a DC08(A), a multiplexor for the PDP8/I. >> The >> >> DC08(A) is not implemented at the moment. >> > >> > >> > This can't be correct. >> > >> > The KL8JA is a single line interface, compatible with the KL8E, >> but using >> > different hardware. You can add lots of KL8E or KL8JA interfaces >> to a PDP8, >> > if you wanted to. Each have a different device code, and that's >> all there is >> > to it. (Talking about the actual hardware here.) In addition, as >> far as I am >> > aware, the programming of these interfaces are pretty much the >> same as the >> > console interface on all other PDP-8 models as well. >> > >> > The KL8A was a very late device for Omnibus, which require a hex >> wide box. >> > It is a 4 line multiplexor, but the programming interface is >> nothing like >> > the KL8JA or KL8E. In addition, not all lines are the same. And >> again, you >> > can add several of these multiplexers to a machine, if you want to. >> >> Agreed... here are the handle numbers to help clarify what we are all >> talking about... >> >> M8319 KL8A PDP-8/A 4 channel serial I/O >> >> M8650 KL8E Asynchronous Data Control (current loop or RS232) >> M8655 KL8JA Terminal Control (UART based substitute for M8650) >> >> >> The KL8E and KL8JA are, AFAIK, not easy (or not possible?) to tell >> apart in software. The KL8A is entirely different - the only time >> I've ever used my KL8A was with RTS-8. I'm not sure I have any OS/8 >> code that knows how to talk to it. If it's out there, I'd love to >> read it. >> >> >> There was a significant evolution in the PDP8 family's IO >> controllers >> >> from the original 8 and 8/I to the Omnibus-based 8/E and 8/A. >> >> Very true. I have a bunch of the real hardware spanning the entire >> era and, yeah, Omnibus devices and pre-Omnibus devices are commonly >> different (I think the console 03/04 interface is, up to the DECmate >> era, the most compatible across the spectrum). >> >> -ethan >> _______________________________________________ >> Simh mailing list >> Simh@trailing-edge.com <mailto:Simh@trailing-edge.com> >> http://mailman.trailing-edge.com/mailman/listinfo/simh >> <http://mailman.trailing-edge.com/mailman/listinfo/simh> >> >> _______________________________________________ >> Simh mailing list >> Simh@trailing-edge.com <mailto:Simh@trailing-edge.com> >> http://mailman.trailing-edge.com/mailman/listinfo/simh >> <http://mailman.trailing-edge.com/mailman/listinfo/simh> >> >> >> >> _______________________________________________ >> Simh mailing list >> Simh@trailing-edge.com >> http://mailman.trailing-edge.com/mailman/listinfo/simh >> >> _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh >
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