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From: tim@NCoast.ORG (Tim Stradtman)
Newsgroups: comp.misc,comp.os.cpm
Subject: Re: Sierra Data Sciences
Keywords: serial ports
Message-ID: <1990Sep27.190851.120@NCoast.ORG>
Date: 27 Sep 90 19:08:51 GMT
References: <3103@unocss.unomaha.edu>
Organization: North Coast Public Access *NIX, Cleveland, OH
Lines: 31

In article <3103@unocss.unomaha.edu> mlewis@unocss.unomaha.edu (mlewis) writes:
>
>I recently acquired a Sierra Data Sciences SBC and system and have a 
>teeny tiny problem.  There are two serial ports on teh board, clearly 
>marked as to which is a terminal port and which is the printer port. 
>The problem is that there is a largish number of jumper points directly
>below the header on the board, which I must assume are there to configure
>the port characteristics.  I have no idea what the jumpers ought to look 
>like, and my clone won't talk to it, or vice versa...

The jumpers are setup so that you can swap 2/3 and 4/5, and play around
with 6,8 and 20.  In general, for a modem you want something like:

	o     o     o     o    o    o     o    o     o
        !           !          !          !
        o     o     o     o    o    o     o    o     o

You won't be able to follow the traces without an ohmeter, as some
of them are on the inner layers of the board.  If you want, I
can send you the wiring.  I'd send it now, but I don't remember it
exactly... 

I used to work for SDS, and have a complete set of manuals available,
as sell as a working 4 user system.

Hope this helps
Tim

-- 
Tim Stradtman
tim@ncoast.org    or   ak215@cleveland.freeent.edu