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  • MattisLind's Avatar
    Today, 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
    8 replies | 164 view(s)
  • jackrubin's Avatar
    Today, 03:11 PM
    Cheers from the Peanut Gallery!
    237 replies | 28038 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 | 53 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 | 53 view(s)
  • jackrubin's Avatar
    November 21st, 2020, 06:04 AM
    Todd Goodman (lives in the US) also placed a quantity order for some of these connectors back in March of this year when I helped Volker with his...
    8 replies | 261 view(s)
  • jackrubin's Avatar
    November 16th, 2020, 01:44 PM
    Hi Simon! Take a look at Jorge Hoppe's fiche scanning adventures - http://retrocmp.com/projects/scanning-micro-fiches
    96 replies | 22383 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 | 166 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 | 166 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 | 206 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 | 206 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 | 5000 view(s)
  • jackrubin's Avatar
    November 2nd, 2020, 07:45 AM
    Hi Dave, Glad to see this project is still sustaining a little bit of your attention :>) . I'll grab the new manual and take a look. Let us know...
    237 replies | 28038 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 | 1126 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 | 1631 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 | 1126 view(s)
  • jackrubin's Avatar
    October 30th, 2020, 11:06 AM
    Miata MX5 motherboard??
    61 replies | 3409 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 | 1126 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 | 1126 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 | 5000 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 | 1126 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 | 1126 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 | 1126 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 | 355 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 | 355 view(s)
  • jackrubin's Avatar
    October 26th, 2020, 08:41 AM
    jackrubin replied to a thread Fixing a PC09 in DEC
    Sounds like the perfect job for a summer intern. Too bad it's autumn.
    4 replies | 355 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 | 355 view(s)
  • m_thompson's Avatar
    October 24th, 2020, 04:36 PM
    We are working on a Cromemco 8k Bytesaver in an Altair 8800 at the Rhode Island Computer Museum. Today we found that the 30V power supply was not...
    28 replies | 1126 view(s)
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About m_thompson

Basic Information

About m_thompson
Biography:
Volunteer at the RICM. Working on a PDP-12, PDP-8/I, 8/L, 8/e, PDP-9, 11/34a, and 11/44.
Location:
Rhode Island
Interests:
Vintage minicomputers.
Occupation:
Engineer

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Member of the Rhode Island Computer Museum
http://www.ricomputermuseum.org

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