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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

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Guessing a Kaypro II model, again!

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    #16
    Originally posted by Bungo Pony View Post
    I just finished repairing the one on my Kaypro. I tried searching for identical connectors on line with no success. I had to take a different approach to repairing it. I scrounged up an old telephone, took out the circuit board, removed the surrounding components, cut it out, drilled some holes, used some standoffs, and I've got a much better and more solid keyboard plug. I haven't tried it yet since I have yet to make some Kaypro system disks.

    [ATTACH=CONFIG]29425[/ATTACH][ATTACH=CONFIG]29426[/ATTACH]
    Very good looking replacement, congrats!. Mine arrived broken into pieces; but the ones found inside the keyboard case were enough to rebuild it as a functional connector. Not pretty; but it works

    About the images, there're a lot of them and probably only a few will work with each model. I tried first a couple of them and fooled me to think that the Kaypro was bad, mispelled typing and garbage chars at boot.

    Now I'm trying to know how to program the PIO, I need to toggle PB0 bit. Seems that it's the way the banked character generator is switched between english and greek charmaps. I can replace it with another EPROM to bring the Kaypro some "high resolution" (160x96)
    Last edited by jltursan; February 7, 2016, 11:34 PM. Reason: Added info

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      #17
      My keyboard connector works great. I made some disk images and they work. However, it looks like I'll be tearing it apart again. The characters are sitting a bit too far to the right on the display, so I need to figure out how to move it more central. Also, they keyboard isn't holding up so well. The letter "A" has almost all but quit working, so it looks like I'll need to pull the keyboard apart and give the contacts some cleaning.
      My blog on finding electronic treasure, audio oddities, and anything else I find interesting

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        #18
        Originally posted by Bungo Pony View Post
        My keyboard connector works great. I made some disk images and they work. However, it looks like I'll be tearing it apart again. The characters are sitting a bit too far to the right on the display, so I need to figure out how to move it more central. Also, they keyboard isn't holding up so well. The letter "A" has almost all but quit working, so it looks like I'll need to pull the keyboard apart and give the contacts some cleaning.
        There's a PCB inside with pots to adjust the monitor geometry, IIRC all is documented in the technical manual. Must be an easy task
        Mine is now fully assembled and working.

        I've dumped both boot ROM and double character generator. no idea if there's a Kaypro's active preservation scene...

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          #19
          Originally posted by jltursan View Post
          There's a PCB inside with pots to adjust the monitor geometry, IIRC all is documented in the technical manual. Must be an easy task
          That's pretty much what I figured. I'll have to do that to mine yet. In the meantime, I have a much bigger task at hand...

          I opened up the keyboard to see what's going on. What I found is that the bottom side of each key has a piece of foam, and a circular piece of metal attached to the end. The foam is facing the same fate as all the 8-track tapes I've fixed... the foam is deteriorating. The entire keyboard is going to need refurbishing; replacing each key's foam. It's a fairly large job.

          The best way I can see to repair it is to get some open-cell foam tape from the hardware store, although I'm not sure what thickness I'll need yet. There's also the task of re-attaching the conductive metal which appears to be not unlike aluminum foil.

          Your keyboard will probably eventually see the same fate as mine if it hasn't already started, so be prepared for a big job!
          My blog on finding electronic treasure, audio oddities, and anything else I find interesting

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            #20
            I've never repaired a foam keyboard like that, but there are quite a few write-ups of repairs like that online, somewhere.
            Be polite and I may let you live.

            https://www.youtube.com/playlist?lis...5NBVfKX5471R9U

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