simh simulation speed (fwd)

[Vintage Computer Festival]

Forwarded from Bob Supnik...

---------- Forwarded message ----------
Date: Mon, 27 Sep 2004 21:38:48 +0000
From: bsupnik at comcast.net
To: Vintage Computer Festival <vcf at siconic.com>
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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