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<title>Simh Digest, Vol 66, Issue 9</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It seems to me that if you want to see multiple VAX CPU support,
it would be better to simulate a more popular and well documented system, such
as the VAX 6000/7000 series.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>As you point out, the 11/784 was such a rare beast that you
would probably be hard-pressed to find decent documentation. Nor would you
likely be able to find real hardware to compare the simulated behavior against.
:-)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Also, AFAIK, VMS dropped support for the 11/784 at one point,
due to no longer having a working model on which to verify behavior, just like
they dropped the MicroVAX I, the 11/725, the 11/782, the MicroVAX 2000 etc... :-(<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dave<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> simh-bounces@trailing-edge.com
[mailto:simh-bounces@trailing-edge.com] <b>On Behalf Of </b>Boucher, François<br>
<b>Sent:</b> Thursday, May 28, 2009 2:57 PM<br>
<b>To:</b> simh@trailing-edge.com<br>
<b>Subject:</b> Vax 11/780 with multiple CPUs?<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Hi to all!</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
would be interested to help develop a <span class=mw-headline>VAX-11/784 with
simh, ie a VAX 11/780 with multiple CPUs</span></span><span style='font-size:
10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The <b>VAX-11/784</b>,
code named "<i>VAXimus</i>", is a very rare configuration consisting
of four VAX-11/780 CPUs sharing a single MA780 memory unit (Excerpt from
wikipedia)</span><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p><span style='font-size:10.0pt'><a href="http://en.wikipedia.org/wiki/VAX-11">http://en.wikipedia.org/wiki/VAX-11</a><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Since the VAX 11/780 CPU code is already developped, there
would only be a need to create a </span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>thread
on a process per CPU the emulated CPUs. With some multicore host
machines available, this</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>would
be relatively easy to have the host machine support such a setup. But on
the software side, is it</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>possible
to adapt simh to use multithreading?</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Where
I am stopped at, is: how to implement the changes in simh to add one of
more cpu(s), and where can i get</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>the
console rom binary code needed to support the multiple CPUs on the simulated
vax 11/784?</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Also,
on the 11/780, the sim implements the MS780C memory controller, while the
11/784 uses</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>the
MA780. Where could I find the documentation where the differences are
between the two</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>memory
controllers?</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks
in advance to all for help / pointers on this!</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>François Boucher</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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