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Thread: obscure system attached to a fluxgate magnetometer

  1. #1
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    Default obscure system attached to a fluxgate magnetometer

    came across this system recently so i rescued it curious thing it is.

    from discsions on the mailing list facebook and discord it is either part of a system that flew on planes looking for ore bodies oil and gas ect or was custom built for the usgs to mesure the magnetic feild of witch 6 systems where built that went around the world.
    https://books.google.ca/books?id=JaQ...uxgate&f=false

    seeing the case in the rack its in u would think this was some beast but then when i opened it its a single board with a analog to digital converter mounted to it and a psu to one side plus a Keytronic keyboard on the front of it and display





    back side of the rack


    inside the computer case


    hidden under the DAC board is a motorola MC6800L cpu dated 76 and a cluster of mostek ram chips date codes of 1975 and 76. not sure whats on the intel eproms.



    inside the fluxgate box



    this is prolly one of the more obscure things ive come across and happy to give it a home.

    the very bottom of the rack has something like a pdu controllor with a nob thats got 6 settings for different x and y z modes?
    Pegcity bits the home of praire bits and bytes a heritage lost yet not
    Heathkit h89 h77 h11 h10 with some extra bits
    Osborn 1 x2
    pdp8a with asr33 and documentation and software
    GE workmaster with series six PLC and ibm p70 (same as a ge workmaster 2)
    Commodore PC-10 II and other stuff

  2. #2
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    I'd cover those EPROMS asap. Might be REALLY hard to replace.

  3. #3
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    look like been that way for 40yrs
    Pegcity bits the home of praire bits and bytes a heritage lost yet not
    Heathkit h89 h77 h11 h10 with some extra bits
    Osborn 1 x2
    pdp8a with asr33 and documentation and software
    GE workmaster with series six PLC and ibm p70 (same as a ge workmaster 2)
    Commodore PC-10 II and other stuff

  4. #4
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    Quote Originally Posted by 1ajs View Post
    look like been that way for 40yrs
    Yeah in a closed case, right? Not open and exposed to light, I presume.

  5. #5
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    The closest I could come to B. Holland Associates is the B. Holland Enterprises Inc. of Colorado:
    https://opencorporates.com/companies/us_co/19871370826

  6. #6

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    Quote Originally Posted by keenerb View Post
    Yeah in a closed case, right? Not open and exposed to light, I presume.
    Yes, but what kind of light?
    Dwight

  7. #7
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    led's in my house
    Pegcity bits the home of praire bits and bytes a heritage lost yet not
    Heathkit h89 h77 h11 h10 with some extra bits
    Osborn 1 x2
    pdp8a with asr33 and documentation and software
    GE workmaster with series six PLC and ibm p70 (same as a ge workmaster 2)
    Commodore PC-10 II and other stuff

  8. #8

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    Quote Originally Posted by 1ajs View Post
    led's in my house
    LED's have virtually 0 UV of any type. Florescences have some but not much UVC gets through the coating or the glass. Incandescences have almost 0 at the right frequency.
    The EPROM would likely leak down 100s of times faster than any ordinary light. The energy needed to cause the tunneling that would erase the EPROM, requires a threshold energy level. If you don't understand that, look up "einstein photoelectric effect". Only photons of the right energy level will cause loss of data. LEDs have a sharp cutoff in frequency of the light emitted.
    Dwight

  9. #9
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    good to know might pull em see if anyone wants to recover the data off them
    Pegcity bits the home of praire bits and bytes a heritage lost yet not
    Heathkit h89 h77 h11 h10 with some extra bits
    Osborn 1 x2
    pdp8a with asr33 and documentation and software
    GE workmaster with series six PLC and ibm p70 (same as a ge workmaster 2)
    Commodore PC-10 II and other stuff

  10. #10

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    What uP is it. It looks to be a Motorola. Is it a 6800?
    It was clearly part of a larger system. All the terminal strips make that clear.
    It is missing the flux gate coils. I'd guess they would be on a remote location. One can make flux gates with cores that are easily saturated. RF core often are easily saturated.
    Dwight
    Last edited by Dwight Elvey; August 13th, 2020 at 05:29 AM.

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