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Thread: Gary Kaufman's IMSAI MPU-A Reproduction Board

  1. #1
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    Default Gary Kaufman's IMSAI MPU-A Reproduction Board

    Some of you have probably heard mumblings online about how someone's doing an IMSAI MPU-A reproduction. Behold:



    Gary Kaufman had a blank IMSAI MPU-A scanned and did a prototype run of boards. This is the same scanning technique that we've used on the OSI reproduction boards and my SSM IO-2 reproduction. I tweaked the Gerber files for him and added info regarding the design's status as a reproduction. Gary will be selling production-run blank boards soonish at around $30-40 per board depending on final costs. The boards will be run with hard gold edge plating (the prototype above is HASL, of course). I'll be building up a few parts kits for these boards.

    Intel 8216 bus buffers replaced with their Soviet clone counterpart:



    Running in my IMSAI:



    You can see garbage from the Polymorphic VTI on the little monitor; it hasn't been initialized yet. I dropped in a ROM board with the Vector Graphic ROM monitor with VTI drivers:



    It lives! Full album here: https://imgur.com/a/tAepr

  2. #2
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    Neat!!!
    Spread the joy of Vintage Addiction

    -->www.chronworks.com/<--->www.i8008.net/<--

  3. #3
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    Quote Originally Posted by 8008guy View Post
    Neat!!!
    Board are in production, and I'll offer them up in a few weeks.

    I also have Altair 8080 CPU boards being fabricated.

    Several folks including Glitch have been a huge help in making this possible.

    - Gary

  4. #4
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    There will be parts kits available for both, as well. Just got in an order of correct Thermalloy heat sinks!

  5. #5

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    Quote Originally Posted by gekaufman View Post
    Board are in production, and I'll offer them up in a few weeks.

    I also have Altair 8080 CPU boards being fabricated.

    Several folks including Glitch have been a huge help in making this possible.

    - Gary
    Did you do a prototype run of the Altair CPU too? If so has Glitch and/or others tested a prototype of the Altair CPU?

    When orders are taken I'll commit to three (3) each of the Imsai and Altair CPU boards and parts kits for all.

    - Jeff
    ---
    KF7CRU @jhalbrecht @TheRetroWagon Looking for Cromemco 16FDC please contact me.
    http://www.theretrowagon.com/vcf-west-2017/

  6. #6
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    I did a prototype run of the Altair CPU as well. Here's a picture of a board built up by Martin Eberhard.

    - Gary
    Altair CPU Prototype ME_c.jpg

  7. #7
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    What are the prices for bare boards?
    Spread the joy of Vintage Addiction

    -->www.chronworks.com/<--->www.i8008.net/<--

  8. #8
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    Just waiting to figure my final costs, but will be in the $30 - $40 each range for bare boards. About 1/2 the cost will be going to cover the purchase/borrowing of the bare boards, scanning and prototype production/shipping.

    I should be ready to offer boards in about 2 weeks.

    - Gary

  9. #9
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    The Altair CPU board has been corrected from "CPU BB" to "CPU BD" in the final production Gerbers

    Super excited to have reproduction boards actually *available* to us hobbyists at a fair price. I believe Gary is running them full-spec with hard gold plating and all, so they should also be very *durable* reproductions. Drives me nuts to see more expensive boards with HASL or ENIG on an edge connector!

  10. #10
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    Quote Originally Posted by glitch View Post
    The Altair CPU board has been corrected from "CPU BB" to "CPU BD" in the final production Gerbers
    I thought that was on purpose because they are so close It is an excellent reproduction.

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