Good point, but at least in my case that's definitely not the issue.  

I just tried again, first with the DISPLY tool (like Unix "top") running, 
updating every 5 seconds.  The update interval is clearly too long and it seems 
to grow.

I then just ran a simple test doing 5 second "sleep" operations.  One took 
about 7 seconds, the next over 10, the third never finished.   When I stopped 
the simulation, I noticed I was in a SOB instruction, but "step" would simply 
show that instruction again, and when I "continue" with CPU history enabled, 
history shows absolutely nothing.  I don't have a clue how that can happen, but 
it certainly suggests that SIMH is doing something wrong when throttling is 
enabled.

        paul

> On Sep 9, 2016, at 12:56 PM, Johnny Billquist <[email protected]> wrote:
> 
> This might be a stupid suggestion, but make sure the system isn't generated 
> for 60hz and the line frequency set to 50hz.
> 
> Johnny 

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