[Simh] MicroVAX 3900 simulator fails BIST sometimes?

[Zane Healy]

Sounds like I’ve been lucky.  My main SIMH VAX uses a fairly current MicroVAX 3900 build, mainly for virtual tape support, the others are using the prebuilt 3.8 build available in Ubuntu and Raspian.

Zane


> On Jun 23, 2018, at 12:57 PM, Alan Frisbie <Frisbie at Flying-Disk.com> wrote:
> 
> So I'm not alone!   I have seen the same thing, but since it
> wasn't causing me any problems I didn't bother reporting it.
> 
> Alan Frisbie
> 
> On 06/23/2018 11:55 AM, Mark Pizzolato wrote:
> > This problem is not unique to you.  I have not been able to
> > reproduce the problem with enough debug information to track
> > down the details of the cause.  The problem report relates
> > to the boot ROM’s internal clock/timer diagnostic.  In all
> > of my test cases, with debug information being gathered,
> > Heisenberg effects mean that the problem is never seen.
> 
> > Robert Armstrong wrote
> > > I’ve found that on occasion the MicroVAX 3900 simh will fail
> > > the built in self test.   Just to be clear, this is the self
> > > test that’s in the MicroVAX-III EPROM image that’s failing;
> > > it’s not VMS.
> 
> 
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