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<p>On 11/18/21 1:35 PM, Paul Koning wrote:<br>
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<pre class="moz-quote-pre" wrap="">On Nov 18, 2021, at 1:26 PM, Supratim Sanyal <a class="moz-txt-link-rfc2396E" href="mailto:supratim@riseup.net"><supratim@riseup.net></a> wrote:
On 11/18/21 11:10 AM, R. Voorhorst wrote:
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<pre class="moz-quote-pre" wrap="">Hi,
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<pre class="moz-quote-pre" wrap="">Hi.
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2. The simh config file for configuring a working simh Pdp11/34 with the proper throttling to make it work; the proper setting is important because of Chk11 init phase which is instruction timing based!!!
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<pre class="moz-quote-pre" wrap="">How does one arrive at a realistic argument for throttle? Did you put 2000/1 because you reckon your host processor does 2000 instructions in the same time as the guest processor does 1? Or is it more pure clock speed based?
SET THROTTLE 2000/1
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Check the docs ("help set throttle"). The simplest is to say what instruction rate you want: "set throttle 300k" is probably a pretty realistic setting to make it look like an 11/20; "set throttle 2m" is a somewhat optimistic 11/70.
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<p>I am interpreting the "2000/1" as "wait 2 seconds after one
instruction" which cannot be right, hence my question.</p>
<p>BTW, throttle is dicey; my MicroVAX 3800 (the SIMH "vax")
machines are set to 1.9 mips (3.8 times of the 0.5 mip 11/780),
but still they grab 100% of a core running *BSD.</p>
<p>But this is a discussion for the SIMH forum, not here.<br>
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paul
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