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Thread: Wanted a PDP8 3-Card Full Edge Header Block.

  1. #1
    Join Date
    Apr 2014
    Location
    Dordrecht , Netherlands
    Posts
    141

    Default Wanted a PDP8 3-Card Full Edge Header Block.

    What I am looking for is a Header block (Top Cards OMNIBUS) to connect
    3-cards at ones.

    I have a set of 3 cards that needs at the top to be connected.
    Sadly this top connector was not placed on top of the cards any more in my system.

    I Think it has the same connections as a single edge connector block.
    But now for 3 cards all 4 edge at 1 time.

    EDIT: Looking again at the picture -seems to be 2x a 3-card having 2x edge connector.
    So 2 blocks that holds 2x edge connector for 3 cards.


    Of course I can think of some kind of connector made of single connectors.
    But If some one has it laying around doing nothing would be great.
    Price is something we surely get an agreement on...

    Thanks for the help.
    Maurice

    See picture what I mean.

    Attachment 54614

  2. #2
    Join Date
    Sep 2006
    Location
    Silicon Valley
    Posts
    1,920

    Default

    It isn't a standard DEC connector, it was a custom made by Tennecomp
    You aren't going to find one.

  3. #3
    Join Date
    Apr 2014
    Location
    Dordrecht , Netherlands
    Posts
    141

    Default

    Thanks for the reply,
    I'll have to make one off my own from some separate connectors.

    Would not be that of a big problem.

  4. #4

    Default

    If they are traditional DEC edge connector standard it can be awkward to obtain the correct pitch. You can get suitable ones from Douglas Electroncs. Shallower than the correct DEC ones, and you need to fabricate end stops, but do the job.

  5. #5

    Default

    Hi Maurice,

    Do you have pictures of the board set? I had a Plessey RK8E controller without the top connector.
    It was also a PCB which connected the boards at once. But the pitch was the dec standard.
    I got a H803 from Lou and I solved it in this way:
    http://www.vcfed.org/forum/showthrea...322#post537322
    PCB files are in my github...

    But if all three of your boards have four connectors then it's going to be a different story....
    Then the EDAC 346-036-520-201 might be a solution...

    Dinsdag heb jij je IC's verwacht ik!

    Regards, Roland
    Last edited by Roland Huisman; July 15th, 2019 at 11:42 AM.
    WTB: Case for Altair 8800 ...... Rolands Github projects

  6. #6
    Join Date
    Apr 2014
    Location
    Dordrecht , Netherlands
    Posts
    141

    Default

    The TP cards have the same card edge pitch as the DEC cards have.
    See attached photo.

    @Roland
    Indeed a good idea to use an old scrap base board and make 2 of those connectors out of it.
    Now have to find a scrap base Omnibus board.

    I Alway's say "Think in solutions"...

    TPcard-Edge Pitch controle.jpg

  7. #7
    Join Date
    Apr 2014
    Location
    Dordrecht , Netherlands
    Posts
    141

    Default

    I ordered a couple of 100 pin S100 Bus Backplane 0.125' 3.175mm Pitch Card Edge Connector.

    Should fit also the board thickness of 1,57mm.

    100 pin S100 Bus Backplane-conn1.jpg

    Then I'll connect them like the H851, should be the right way just parallel.
    DEC-H851_3x_Edge Conn-Sch.jpg

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