[rescue] Help with SUn 3/140

Earl D. Baugh Jr. earl at baugh.org
Tue May 29 00:46:57 CDT 2007

> Date: Fri, 25 May 2007 17:22:55 -0400
> From: Patrick Finnegan <pat at computer-refuge.org>
> Subject: Re: [rescue] Help with Sun 3/140
> On Friday 25 May 2007 15:47, Earl D. Baugh Jr. wrote:
>>> Date: Thu, 24 May 2007 14:25:12 -0400 (EDT)
>>> From: Ethan O'Toole <ethan at 757tech.net>
>>> Subject: Re: [rescue] Serial on Sun 3/140
>>> Hmmmm.
>>> Turn off hardware and software handshaking. Short pin 2 to 3 on
>>> DB25 or
>>> DB9 serial cable, and see if you can see what you type. This
>>> verifies the
>>> host is working.
>> Cool trick,  I hadn't ever know of that before.  A paper clip and I
>> got confirmation
>> that the host and cables are working.
> One thing that this doesn't check, is if you have Tx and Rx correct
> respective to each other.
> Do you have a null-modem cable or adapter in the connection?
> Pat

Yes, I've got a Null-Modem adapter I had in my box-o-adapters....
one I purchased a long time ago.  It's a full 25 pin one (I've not
actually pin'ed in out to know how it's wired up, but I've used it in
the past with other serial devices so don't expect it's wrong or  
at this point... though cable rot could have set in...   <dig dig dig>
Yeah, and it's the only one in the box I've got.   Got every type
of 9 and 25 pin gender changer and 9-to-25 pin adapter, but
that's the only null modem adapter.   I'm running 25 pins straight
through from what I can tell...  I guess I can try swapping it out
with different cables (but with the lights I was seeing I suspected
that I had the cable right...)   I don't have any external modems
about or other serial devices to experiment on...unless I tried it on
one of my newer Sun's...(i.e. the 420R..)  I'll give that a shot to
rule out the cables...

I'm open for any other suggestions from anyone....  could the
jumper settings on the VME bus cause this type of behavior??


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