[prev in list] [next in list] [prev in thread] [next in thread] 

List:       classiccmp
Subject:    RE: Reset NVRAM on DECstation 5000/240
From:       Rob Jarratt via cctalk <cctalk () classiccmp ! org>
Date:       2017-07-31 20:25:25
Message-ID: 00fd01d30a3b$2488f520$6d9adf60$ () ntlworld ! com
[Download RAW message or body]



> -----Original Message-----
> From: Maciej W. Rozycki [mailto:macro@linux-mips.org]
> Sent: 31 July 2017 14:26
> To: rob@jarratt.me.uk; Rob Jarratt <robert.jarratt@ntlworld.com>; General
> Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org>
> Subject: Re: Reset NVRAM on DECstation 5000/240
> 
> Hi Rob,
> 
> > I am trying to get my new 240 going. Unfortunately all the diagnostic
> > LEDs stay lit. From when I had a previous DECstation 5000/240 I found
> > a note that I fixed this by resetting the NVRAM with a jumper.
> >
> >
> >
> > Unfortunately I did not record which jumper where, and I can't find
> > mention of this in any of the docs I have. Can anyone tell me if it is
> > the jumper near the CPU daughterboard?
> 
>  It is.  Check the "DECstation/DECsystem 5000 Model 200 Series Maintenance
> Guide" (EK-PM38C-MG-002), available online.
> 

I have that manual. Having checked again I realise I should have searched
for "NVR" and not "NVRAM", then I would have found it!!

> > Also, can anyone tell me what the jumper on the base board under the
> > leftmost TURBOchannel slot might be (on the left when looking from the
> > back of the machine)?
> 
>  Technically it's wired to one of the 16 IOASIC external interrupt inputs,
which is
> otherwise unused.  Functionally it tells software whether the mainboard is
used
> in a 5000 or a 5900 system configuration.  I can dig out the exact details
if
> you're interested.


That would be interesting, if there is documentation that isn't generally
available it would be good to see it.


> 
>  BTW I saw your 5000/240 web page and I'm glad that you have rescued all
> that fine hardware.  Also I think you don't have to worry about the H7878
PSU --
> apparently none of the caps used in that model suffers from the dreaded
> quaternary ammonium salt issue.


Thanks. I will create a page describing the machine in the coming days, for
now it will just be the blog posting. I do think there is a problem with the
PSU though because it will be just sitting there in the console and power
off, you can't turn it back on until you pull out the power cord. I am going
to check the caps more closely.

> 
>  Last not least, I don't keep up with mailing list traffic, so for a
shorter RTT
> please feel free to CC me on any DECstation stuff.
> 
>  HTH,
> 
>   Maciej

[prev in list] [next in list] [prev in thread] [next in thread]