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Thread: Another DEC UNIBUS signal adapter: UniProbe

  1. #1

    Default Another DEC UNIBUS signal adapter: UniProbe

    Hi,

    most people dealing seriously with older PDP-11s have found means to monitor the UNIBUS traffic.
    My latest approach is www.retrocmp.com/tools/uniprobe
    UniProbe is a M9302 terminator, a LED display, a probe for logic analyzer.
    It can be mounted in Standard or Modified UNIBUS sockets.

    I'm ordering a batch of PCBs in a few days and will show this and other stuff (UniBone, BlinkenBone) at VCFPNW in Seattle.
    https://vcfed.org/wp/festivals/vinta...fic-northwest/

    best regards,
    Joerg

  2. #2
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    Default

    That looks very nice. My employer make LEDs that would be perfect for this application, but unfortunately they are quite expensive. https://www.digikey.com/product-deta...75-ND/4210104&

    I have a similar device for VME that is quite old. It includes a CPU that can look for timing and protocol violations. That could be done with the logic analyzer.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  3. #3

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    Hi,
    Quote Originally Posted by m_thompson View Post
    That looks very nice. My employer make LEDs that would be perfect for this application, but unfortunately they are quite expensive. https://www.digikey.com/product-deta...75-ND/4210104&
    I searched for similar LEDs a while, without sucess. Your link seems to point to 5mm LEDs, do you know of 1.8mm mounts too? However $8 per piece is indeed beyond any limit.
    kind regards,
    Joeg

  4. #4

    Default

    Quote Originally Posted by Joerg Hoppe View Post
    Hi,

    most people dealing seriously with older PDP-11s have found means to monitor the UNIBUS traffic.
    My latest approach is www.retrocmp.com/tools/uniprobe
    UniProbe is a M9302 terminator, a LED display, a probe for logic analyzer.
    It can be mounted in Standard or Modified UNIBUS sockets.

    I'm ordering a batch of PCBs in a few days and will show this and other stuff (UniBone, BlinkenBone) at VCFPNW in Seattle.
    https://vcfed.org/wp/festivals/vinta...fic-northwest/

    best regards,
    Joerg
    Looks very interesting! I need to debug a 11/10, is this suitable?
    Thanks
    Frank

  5. #5

    Default

    nice job.
    @ BillDeg:
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  6. #6

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    Quote Originally Posted by iz8dwf View Post
    Looks very interesting! I need to debug a 11/10, is this suitable?
    Thanks
    Frank
    Short answer: YES.
    Long version:
    I both have a "slim" and a "big" 11/05, but did not yet plugged UniProbe into them. Should do!
    The "slim" CPU backplane has the Standard UNIBUS not at the backplane end, but in the middle at socket #3.
    The "big" 11/05 CPU has Standard UNIBUS most far away from the CPU, as expected.
    All 11/05 resp '10 use the M930 terminator, without the M9302 "SACK turnaround" feature.
    And no 11/05 has an "Modified UNIBUS" socket.

    kind regards,
    Joerg

  7. #7
    Join Date
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    Default

    Quote Originally Posted by Joerg Hoppe View Post
    Hi,

    I searched for similar LEDs a while, without sucess. Your link seems to point to 5mm LEDs, do you know of 1.8mm mounts too? However $8 per piece is indeed beyond any limit.
    kind regards,
    Joeg
    Those are 3.2mm, the only ones that we have.
    https://schroff.nvent.com/en/schroff/69004-125
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

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