simh simulation speed (fwd) - test-drb@ccmp.vtda.org

27 Sep 2004

Forwarded from Bob Supnik...

---------- Forwarded message ----------
Date: Mon, 27 Sep 2004 21:38:48 +0000
From: bsupnik(a)comcast.net
To: Vintage Computer Festival &lt;vcf(a)siconic.com&gt;
Subject: Re: simh simulation speed

Unless the simulator writer inserts timing (delay) code, as Phil did for
the PDP11, SIMH runs as fast as possible. In the case of the LGP30, this
is many, many times faster than the real machine.

/Bob

...
  On Mon, 27 Sep 2004, Tom Jennings wrote:

  I haven't had a chance to get back and debug,
but is it true that simh
 does NOT simulate the target machine's execution speed? I wrote a simple
 'sum all words in track N' program for the LGP and it completed as soon
 as I hit return! It should have taken many seconds... I did RTFM, so no
 reference to it, but I haven't had time to go look at the source. Got
 lazy and decided to post instead of research (typical, huh :-) 
 I wondered that myself.  SpaceWar! on the PDP-1 seems to run at its
 original speed.

 --

 Sellam Ismail                                        Vintage Computer Festival
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