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31009Re: PDP-11/20

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  • s100doctor
    May 28, 2013
      --- In midatlanticretro@yahoogroups.com, David Gesswein <djg@...> wrote:

      > Looking in through the side the first couple of cards were being pressed
      > by the foam. The foam was stiff but the amount they were pressed in wasn't
      > that far. The later cards didn't seem to be pressed at all. I didn't see
      > anything obvious indicating the foam caused the problem but it was removed.

      I looked over David's shoulder at the work he reported and got similar impressions. I was concerned that the "foam" - actually more like rubber anti-static matting which is heavier - was so unyielding, that it pushed some of the one-width cards sideways out of position or contact. The two-width and four-width cards can't be pushed "sideways" in that fashion. I believe I suggested removing that material; I saw it was removed in any case.

      The 11/20 is challenging in that the front panel is upside-down relative to the cards. Thus if the 11/20 is mounted for use, the cards hang "under" the backplane. It may be that *soft* foam is needed (not necessarily antistatic) to hold the cards in place. More DEC-11 experienced people can address this.

      Herb Johnson
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