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Re: Solarus 8/9 Sparc Questions

Greg A. Woods woods@weird.com
Tue, 4 Mar 2003 13:18:34 -0800 (PST)

[ On Tuesday, March 4, 2003 at 09:12:44 (-0500), Mike Daigle wrote: ]
> Subject: Re: Solarus 8/9 Sparc Questions
> The only solution which I have found that gives satisfactory
> results is the Nudata(TM) Non Aborting Serial Port Adaptor.  This
> is a little black box that cost about $90. It has smarts onboard
> and allows the BREAKs to be sent from a terminal or terminal
> server port. But it monitors the DTR line, if it drops then the
> box blocks all input, thus if a terminal server sends breaks at
> power down they are blocked when DTR drops first. There is a
> timing issue here but it seems to work, I suspect they have a
> transmission delay built in to catch the fault before the BREAK is
> sent but I don't know this for sure.
> The beauty of it is that we can still use BREAK to halt the system
> if we want. If the terminal server looses power all our Sun's
> DON'T halt. It would also cover off any problems of the line being
> cut and looking like a break as long as DTR is cut at the same
> time.
> The only down side is the price tag.


Time to (again?) post the link to circuit diagram of what I believe is
an equivalent device.

The diagram was originally posted in sun-spots v5n45 by Malcolm Harper,
back before the WWW and most copies are in compressed archives and thus
not indexed by the likes of Google.  A copy can now be found at this


The relevant post has been re-copied to at least these locations


								Greg A. Woods

+1 416 218-0098;            <g.a.woods@ieee.org>;           <woods@robohack.ca>
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