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Thread: Wang LOCI-2 Calculator Restoration at the RICM

  1. #1
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    Default Wang LOCI-2 Calculator Restoration at the RICM

    We started working on the RICM's WANG LOCI-2 calculator today. This is a core memory, microcoded, transistor only programmable calculator with some very interesting design features. It does multiply and divide by converting to logarithms adding/subtracting the logarithms, and converting the answer back to decimal. We even have the Teletype interface for it.

    It looks like there are some incorrectly performed repairs that we need to fix before we can get started on debugging.

    Info is here: https://www.ricomputermuseum.org/col...i-2-calculator
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  2. #2
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    I'm ashamed to admit that I actually have used one of these back in the day...

  3. #3

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    Texas A&M University had Wang 360SE electronic calculators in the 1970's engineering department "calculator room". I used them for some of the harder Electrical Engineering problems.
    This was prior to the introduction of the personal scientific calculators from HP and TI.



    photo from https://www.oldcalculatormuseum.com/wang360.html

  4. #4
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    Looks like RCA and Fairchild transistors are used. I have some 1970's Fairchild epoxy trans's (2n3638's and others??) and/or RCA 2N697 (might be guessing wrong on that number) and if correct for restoration can be yours. Let me know the correct 2N numbers and I'll look.
    Crazy old guy with a basement full of Pentium 1 laptops and parts

  5. #5
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    Most of the transistors are Germanium 2N404. There are a few on eBay. The original RCA ones are expensive. There are also some 2N3638 and 2N3630.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  6. #6
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    2N404s were very popular back in the day--sort of the modern day equivalent of the 2N2222. There should still be a ton of equivalents around.

  7. #7
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    Quote Originally Posted by m_thompson View Post
    Most of the transistors are Germanium 2N404. There are a few on eBay. The original RCA ones are expensive. There are also some 2N3638 and 2N3630.
    I'm sure I have a few 2N3638's and I might have a couple of 2N404's too. Doubt if I have any 2N3630's, but I'll look. I'll get back to you after Christmas when I have time to dig through my bins.
    Crazy old guy with a basement full of Pentium 1 laptops and parts

  8. #8
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    Quote Originally Posted by DeltaDon View Post
    I'll get back to you after Christmas when I have time to dig through my bins.
    Thanks very much. The RICM is a 501(c)(3) entity so donations are tax deductable.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  9. #9
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    I did a quick look and couldn't find and 2N3630's (not surprised), but I was surprised that I also didn't have any 2N3638's. I guess I used or sold them years ago. I do have 9 pieces of the 2N404A transistors and one 2N404(JAN) mil spec all 10 have full length leads, are TO-5 & unused. After Christmas I will PM you for shipping address.
    Crazy old guy with a basement full of Pentium 1 laptops and parts

  10. #10
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    Quote Originally Posted by DeltaDon View Post
    After Christmas I will PM you for shipping address.
    Thanks a bunch!

    The Rhode Island Computer Museum
    Meadows Office Park
    Bldg C, Suite 103
    1130 Ten Rod Road
    North Kingstown, Rhode Island 02852
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

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