Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!att!dptg!lzsc!hcj
From: hcj@lzsc.ATT.COM (HC Johnson)
Newsgroups: comp.sys.atari.st
Subject: Re: My experiences with PC-Ditto II
Summary: One Marginal connection == intermittant trouble
Message-ID: <1584@lzsc.ATT.COM>
Date: 11 Apr 90 12:49:32 GMT
References: <1990Apr9.125813.635@gpu.utcs.utoronto.ca> <2823@isc-br.ISC-BR.COM>
Organization: AT&T BL Middletown/Lincroft NJ USA
Lines: 31

In article <2823@isc-br.ISC-BR.COM>, lawrence@isc-br.ISC-BR.COM (Lawrence Kelley) writes:
> In article <1990Apr9.125813.635@gpu.utcs.utoronto.ca> romwa@gpu.utcs.utoronto.ca (Royal Ontario Museum)
> writes:
> 
> 
> >This weekend I happened to notice a new phenomenon:  During the first 15
> >minutes of use I can sometimes hang PC-DITTO.  I suspect that this has to
> >do with the connector/cpu heating up and expanding.
> 
> I have had similar experiences that seems to go away or diminish after the
> system's been on for 15 to 30 minutes.  By any chance, do you also experience
> distortion and jitter on the video.  I have experienced severe problems that

When things are failing, you cannot define the failure mode.
The PC-Ditto II m68000 connector is so flackey by design that any and all
screwey results are possible.

A row of ribbon connector pins is not stable enough to make a reliable pressure
joint.  And the shoulders of a M68000 are absolutely not designed to be a
conatact point.

SOLDER the SOB on and your problems will go away.  

I did this, and two things happened:
1. PC-Ditto II now works great.
2. Half of my memory is now bad.

Howard C. Johnson	Two things happen when you touch a soldering iron
ATT Bell Labs		to a ST.  One of them is bad!
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