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Diagnosing KIM-1 short

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    I'd love to see a video of that!
    @ BillDeg:
    Twitter: @billdeg
    Youtube: @billdeg
    Unauthorized Bio


      I'm try to do that some time.
      I can get my son to be camera man and he
      can plant a short on the board and cover it
      so I can't see it.
      That should make it more official.


        Ive got a couple of questions about PS & Meter settings for your method.

        I understand that you first make sure the Power Supply is isolated, no Earth Ground.

        1. What is the voltage setting on LAB Power Supply, along with the ~2 Amp setting for Ground Plane testing?
        2. Is the DMM DC Voltage setting on Auto Ranging or fixed for .000 Range, or does it matter?
        3. If you are working on an Address Line or Data Line Short versus along the Ground plane, is the PS Voltage same as for Ground Plane & current still ~2 Amps?

        I too would love to see a video of how it works.




          Originally posted by billdeg View Post
          wow. I did as you said and the KIM sprang to life ... at least now there is something on the display. I did not have pin K on the application connector grounded, I did not think I had to unless I was using the +12v...I was just grounding AA only all this time.

 to find a transistor for Q1 so I can read the most significant number of the addresses and test the ROM/RAM. When that's done I will attach to a teletype for input and storage.

          UPDATE: RAM peeks shows ROM in memory matching 6530 listing, yay!

          Link to photo of power leads (note this happens to have been taken while attached to my other KIM, a rev G.):

          Last edited by billdeg; August 27, 2014, 06:23 AM.
          @ BillDeg:
          Twitter: @billdeg
          Youtube: @billdeg
          Unauthorized Bio


            Not meaning to hijack the thread. I usually set the voltage to about 1/3V.
            Once connected it will only be 100 to 200 mv.
            The meter must have a 100 or 200mv range. I use a 5 digit Fluke but it
            is all about getting enough drop to measure a voltage across the trace or board.
            For ground planes I like to use 5 to 10 amperes. This may rerquire soldered
            wires rather than clips, depending on the clips used. These are best at the corners
            of the board.
            Most traces can handle 1 to 2 amperes, even smaller ones. 0.200 volts at 2 amperes,
            across 10 inches of trace is only .04watts per inch. Not enough to worry about.


              Originally posted by gcoville View Post
              This fellow has a very nice scan of the poster. I've spent many hours looking at it.


              (It was nice to see one of my pictures referenced earlier in this thread.)

              If you're having trouble downloading the poster, the Wayback Machine has it too.


              I also put my own mirror online at

              Be patient: the file is 40MB big!