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  • m_thompson's Avatar
    Today, 07:20 AM
    m_thompson replied to a thread RK05 disk drive versions in DEC
    Testing the completely digital boards like the M7680 and M7681 should be easy. The other boards that are partially analog and partially digital will...
    10 replies | 215 view(s)
  • MattisLind's Avatar
    Yesterday, 09:08 PM
    MattisLind replied to a thread RK05 disk drive versions in DEC
    I also have a RK05 exerciser. Will probably get to it sometime before christmas. Will be able to take pictures. /Mattis
    10 replies | 215 view(s)
  • MattisLind's Avatar
    November 21st, 2020, 02:57 PM
    MattisLind replied to a thread Repairing my Tek 4051 in Other
    Thanks a lot Monty! Let's hope I now can get the board working. /Mattis
    2 replies | 54 view(s)
  • MattisLind's Avatar
    November 21st, 2020, 11:26 AM
    MattisLind started a thread Repairing my Tek 4051 in Other
    My Tektronix 4051 has been sitting on the shelf since the analog board blew several years ago. I think it is about time to get back to it and fix it....
    2 replies | 54 view(s)
  • m_thompson's Avatar
    November 13th, 2020, 04:43 PM
    m_thompson replied to a thread DECtape archeology in DEC
    There is a version of Moonlander that runs on the GT40 and uses a light pen for control.
    1 replies | 171 view(s)
  • MattisLind's Avatar
    November 13th, 2020, 09:54 AM
    MattisLind started a thread DECtape archeology in DEC
    I have recovered some DECtapes and DECtape IIs. There were some early XXDP tapes, RT11 dist set for V4 with patches, 11/750 console and diagnostic...
    1 replies | 171 view(s)
  • m_thompson's Avatar
    November 7th, 2020, 10:59 AM
    m_thompson replied to a thread TU55 restoration in DEC
    Doug, There is a rubber band underneath the coiled spring on your hubs. The rubber has turned to rock and won't compress when you try to install...
    4 replies | 209 view(s)
  • m_thompson's Avatar
    November 6th, 2020, 04:32 PM
    m_thompson replied to a thread TU55 restoration in DEC
    The DC power requirements for a TU55 are different from a TU56. If the 8/I came with the TU55s then it will already have the correct power supplies....
    4 replies | 209 view(s)
  • inotarobot's Avatar
    November 3rd, 2020, 06:17 PM
    Thank you Dwight for this informative insight on using Forth. It's probably been over 40years since I last used Forth. Somewhere I still have a Z8...
    26 replies | 2010 view(s)
  • m_thompson's Avatar
    November 3rd, 2020, 01:28 PM
    It is for the frame around an 8/a programmer's panel. Hopefully it is the right color.
    66 replies | 5007 view(s)
  • m_thompson's Avatar
    November 1st, 2020, 05:56 AM
    Next Saturday when I am at the RICM I will take 'scope images for the transformer pins. I will also measure the resistance for the coils, if that...
    28 replies | 1133 view(s)
  • MattisLind's Avatar
    October 31st, 2020, 04:41 PM
    What about uClinux? It does not require a MMU. Not sure about the current status, though. Here is an example of a minimal computer running...
    11 replies | 1632 view(s)
  • m_thompson's Avatar
    October 31st, 2020, 11:31 AM
    I bought a bag of 25 MPS6560 transistors on eBay. The bad Q10 from the Bytesaver had reasonable diode drops base-collector and base-emitter, but had...
    28 replies | 1133 view(s)
  • m_thompson's Avatar
    October 30th, 2020, 06:24 AM
    I am trying to LT SPICE model the Royer Oscillator, but have not gotten it to resonate yet. Using a pulse generator to control Q10 and can adjust...
    28 replies | 1133 view(s)
  • m_thompson's Avatar
    October 29th, 2020, 10:09 AM
    This is what our power supply designer through that the transformer might look like.
    28 replies | 1133 view(s)
  • m_thompson's Avatar
    October 29th, 2020, 10:02 AM
    I just received some custom made DEC white spray paint from MyPerfectColor.com to repaint PDP-8/e programmer's panels. $63 for three cans including...
    66 replies | 5007 view(s)
  • m_thompson's Avatar
    October 28th, 2020, 06:39 AM
    Our power supply designer guessed at the transformer design. I will try it in LT SPICE to see if it will work, and to determine the turns ratio in...
    28 replies | 1133 view(s)
  • m_thompson's Avatar
    October 27th, 2020, 02:34 PM
    I sent the schematic to one of our power supply designers at work and asked him to guess what is in the transformer.
    28 replies | 1133 view(s)
  • m_thompson's Avatar
    October 27th, 2020, 06:37 AM
    I would like to use LT SPICE to simulate the 30V programming supply, but have no idea what is inside of the transformer.
    28 replies | 1133 view(s)
  • m_thompson's Avatar
    October 26th, 2020, 04:32 PM
    m_thompson replied to a thread Fixing a PC09 in DEC
    The open was where the wire went down the side of the bobbin and made a 90 degree turn to start the winding. I might run the wire down the side and...
    4 replies | 359 view(s)
  • m_thompson's Avatar
    October 26th, 2020, 08:57 AM
    m_thompson replied to a thread Fixing a PC09 in DEC
    You are right, the summer interns are back in school.
    4 replies | 359 view(s)
  • m_thompson's Avatar
    October 26th, 2020, 06:49 AM
    m_thompson started a thread Fixing a PC09 in DEC
    The PC09 paper tape punch on the RICM's PDP-9 has been broken for about 30 years. The Timing Generator coil that senses the crankshaft rotation is...
    4 replies | 359 view(s)
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