[rescue] Unhappy MicroVAX II
IanK at vulcan.com
Tue Apr 16 13:46:00 CDT 2013
> -----Original Message-----
> From: rescue-bounces at sunhelp.org [mailto:rescue-bounces at sunhelp.org]
> On Behalf Of Andrew Hoerter
> Sent: Tuesday, April 16, 2013 9:07 AM
> To: The Rescue List
> Subject: Re: [rescue] Unhappy MicroVAX II
> On 4/16/13, Ian Finder <ian.finder at gmail.com> wrote:
> > Today I got it back, and it no longer wants to do anything- there
> > appears to be some gibberish on the serial lines, but that's not
> Serial line gibberish can be suggestive of a data rate mismatch. I'm not
> what the VAX serial console defaults to, but 2400 or 9600 could be good
> Failing that, and not having any particular knowledge of the uVAX hardware,
> I'd start by checking power -- are you seeing good voltages on all the
> supply rails? If power is flaky, you can see pretty weird behavior.
Ian, this is Ian. :-) Did you only check voltages, or did you scope the
lines? The failure you're describing - won't wake up after a long nap -
immediately makes me think: power supply electrolytics. You might read a
perfectly reasonable voltage with a voltmeter but discover that you have 20%
If you don't have a scope, let's talk - are you still in my part of the world?
UNIX is the answer, but you must phrase the question very very carefully.
Ian S. King, Sr. Vintage Systems Engineer
Living Computer Museum
A presentation of Vulcan, Inc.
More information about the rescue