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Kaypro II Power Supply Ratings

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    Kaypro II Power Supply Ratings

    I've got a Kaypro II with no power supply, what current ratings do I need to satisfy to shoehorn a modern switching supply in there?
    Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

    Kaypro Power Suppy Info

    INFORMATION from my Maintenance Manual:

    Kaypro used three different brands of Power Supplies. They are interchangeable with any of the Kaypro Computers. The Power Supply are Astec, Boschert, and Cal DC.

    If a Power Supply is removed from a 2/83 or a 4/83, and it's going to be used in another computer, it must be used in a 2/83 or 4/83. The Power Supplies used in 2/83 and 4/83
    computers are not interchangeable with other Kaypro Computers.

    ASTEC Power SUpply:
    Identified by a beige board with a white label on the right of the component side.

    Picture in my book shows:
    ASTEC Model AA12350
    Output 65 Watt Max
    +5 VDC 5A
    +12 VDC 3.5A
    -12 VDC .25A

    BOSCHERT Power Suply
    Identified by the word "Boschert" on the Component side of the board at lower right and above the fuse anc capacitor C2.

    CAL D.C. Power Supply
    Identified by a bright blue circuit board. A white sticker with "California DC", Model, and Serial Number is located on the solder side of the board.

    1101 Space Park
    Santa Clara, CA 95050

    384 Santa Trinita Avenue
    Sunnyvale, CA 94086

    Cal DC
    2150 Anehor Court
    Newbury Park, CA 91320

    The address info is probably way out of date. Google for more Info on them.

    Hope this helps.

    Last edited by ldkraemer; May 16, 2013, 08:22 AM. Reason: Add Address Info


      Some more info

      Also go to bitsavers for a copy of the manual
      & search this site for other info in the knowledgebase we developed - there were some soldering issues with some of the power supplies.

      Be aware of the possibility of some lethal voltages - so also check this site for them

      You may want to use someone who is knowledgeable in electronics.

      Good luck !

      Please keep us informed of your progress so we can add to the knowledge base.



        THANKS for the tip on bitsavers. I wasn't aware of it.

        Do you know how one makes contributions to bitsavers? I didn't see any information on how to contact the folks there.

        I've got some Floppy Drive Manuals that might be of help. I've also got a Document on installing and using 3.5" Drives
        on Radio Shack Model 4 Computers, Kaypro's, and my Ampro "Little Board Z80".




          Eight years later, I'm finally fixing this particular Kaypro! And this is the first result when searching for Kaypro PSU ratings

          A Mean-Well RT-85B is looking like a perfect match. I've got one on order and will report back on how well it works in a Kaypro II. Ratings are probably conservative enough for even the Kaypro 10.
          Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More


            I glad to see I'm not the only one out there with projects that seem to take decades to finish! I guess we're just short a few Round 2it's.
            Crazy old guy with a basement full of Pentium 1 laptops and parts


              In my Kaypro 4/83, in which I have added a 10 MB MFM harddisk + controller, I put in a MW MPT-120B Triple Output supply.
              It is almost a perfect match only slightly less length (needed to drill two new holes). I could even reuse the original Kaypro connector.


                Originally posted by gertk View Post
                In my Kaypro 4/83, in which I have added a 10 MB MFM harddisk + controller, I put in a MW MPT-120B Triple Output supply.
                It is almost a perfect match only slightly less length (needed to drill two new holes). I could even reuse the original Kaypro connector.
                Nice! The Kaypro chassis would be a good place to use one of the open frame modules, since the original was anyway.
                Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More