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From: nathan@yatton.inmos.co.uk (Nathan Sidwell)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: Effect of mechanical stress on MCA board
Message-ID: <8709@ganymede.inmos.co.uk>
Date: 24 Jul 90 08:58:10 GMT
References: <1990Jul23.142511.15070@ioe.lon.ac.uk>
Sender: news@inmos.co.uk
Reply-To: nathan@inmos.co.uk (Nathan Sidwell)
Organization: INMOS Limited, Bristol, UK.
Lines: 26

In article <1990Jul23.142511.15070@ioe.lon.ac.uk> teexmmo@ioe.lon.ac.uk (Matthew Moore) writes:
>Does anyone know what the effect of mechanical stress on an MCA board
>would be?
> [describes problems with PS/2 70 & 55X]

I had a similar problem with a PS/2 80. When developing a card, it would work
fine with the lid off, but sometimes not when I put the lid on. The problem
was not just with my card, but with the memory expansion too. It appears that
the foam packing on the lid, which is supposed to hold the cards in tightly
was overzealous, and pushed down on the card handle, thus levering the
other end of the card out. The solution was to cut away the offending bit of
foam. It has worked fine for the 2 years since then.

                        Foam pressed here
                              V
                            +--+
      +---------------------+-+|
      |                       ++
      |                       |
      |                       |
      +--|||||||--------------+

--------------- So what's your mission statement? ----------------
Nathan Sidwell, INMOS Ltd,            JANET:    nathan@uk.co.inmos
Aztec West, Bristol, UK               UUCP:     ukc!inmos!nathan
My indicision is final (I think)      INTERNET: nathan@inmos.com