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  • m_thompson's Avatar
    Yesterday, 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 | 257 view(s)
  • MattisLind's Avatar
    November 23rd, 2020, 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 | 257 view(s)
  • jackrubin's Avatar
    November 23rd, 2020, 03:11 PM
    Cheers from the Peanut Gallery!
    237 replies | 28237 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)
  • 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 | 267 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 | 22445 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 | 211 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 | 211 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 | 5016 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 | 28237 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 | 1157 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 | 1157 view(s)
  • jackrubin's Avatar
    October 30th, 2020, 11:06 AM
    Miata MX5 motherboard??
    61 replies | 3482 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 | 1157 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 | 1157 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 | 5016 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 | 1157 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 | 1157 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 | 1157 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 | 371 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 | 371 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 | 371 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 | 371 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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