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  • MattisLind's Avatar
    May 22nd, 2017, 08:22 AM
    Unless you already read about it I can confirm that a RQDX1 with upgraded firmware to 10.0D works just fine with a 1024 cylinder 8 head RD53...
    8 replies | 1188 view(s)
  • MattisLind's Avatar
    May 22nd, 2017, 05:07 AM
    MattisLind replied to a thread RQDX1 and RQDX2 woes.. in DEC
    MFM emulator updates I have been corresponding with David on the subject of not being able to use the MFM emulator with a RQDX1 or RQDX2. I put a...
    2 replies | 212 view(s)
  • m_thompson's Avatar
    May 22nd, 2017, 03:39 AM
    Unfortunately we don't have near enough power or cooling to run it. It is a Cray T3E-900, so 450 MHz processors.
    14 replies | 583 view(s)
  • m_thompson's Avatar
    May 19th, 2017, 03:54 AM
    m_thompson replied to a thread PDP SBC - J11 Hack in DEC
    Very nice!
    145 replies | 10126 view(s)
  • m_thompson's Avatar
    May 18th, 2017, 07:24 AM
    m_thompson replied to a thread PDP-8/I at the RICM in DEC
    Its a long story, and better told by Charles. I will see if I can get a summary of the OS.
    6 replies | 439 view(s)
  • jackrubin's Avatar
    May 18th, 2017, 04:34 AM
    jackrubin replied to a thread PDP-8/I at the RICM in DEC
    Yes, please!
    6 replies | 439 view(s)
  • m_thompson's Avatar
    May 18th, 2017, 03:49 AM
    I have a VAX BIbus system that was used by a DEC contractor to develop VAXeln software.
    7 replies | 255 view(s)
  • m_thompson's Avatar
    May 18th, 2017, 03:42 AM
    Ken, Our collection has a system with 36 21164 DEC Alpha processors.
    14 replies | 583 view(s)
  • jackrubin's Avatar
    May 17th, 2017, 03:55 PM
    Of course we'd be interested in your story! This is essentially a show-and-tell, ask-and-answer forum. Feel free to wail away - the more nitty-gritty...
    14 replies | 583 view(s)
  • m_thompson's Avatar
    May 15th, 2017, 04:51 PM
    m_thompson replied to a thread PDP 11/45, Part 5 in DEC
    Maybe something like this? https://www.ebay.com/p/general-electric-ge-97f8248-600v-ac-8uf-capacitor-d544094/1618150700?_trksid=p2047675.l2644 Or...
    300 replies | 19542 view(s)
  • m_thompson's Avatar
    May 15th, 2017, 04:49 PM
    m_thompson replied to a thread PDP-12 restoration in DEC
    Our system number and processor S/N were on labels on the inside of the cabinet bar that goes from the upper rear hinge area to the front of the...
    12 replies | 523 view(s)
  • jackrubin's Avatar
    May 15th, 2017, 12:42 PM
    jackrubin replied to a thread PDP 11/45, Part 5 in DEC
    I'm over my head on the electronics involved, but my understanding is that the motor run caps in the TU55, etc. are just that - they store energy...
    300 replies | 19542 view(s)
  • m_thompson's Avatar
    May 15th, 2017, 11:23 AM
    m_thompson replied to a thread PDP 11/45, Part 5 in DEC
    The ones that we replaced were in the smaller supplies in the PDP-8/S, TU-55, etc. They were all standard motor-run capacitors. Motor-start caps are...
    300 replies | 19542 view(s)
  • jackrubin's Avatar
    May 15th, 2017, 08:05 AM
    jackrubin replied to a thread PDP 11/45, Part 5 in DEC
    I'd be interested in learning about your success rate with replacing the caps in ferroresonant circuits. It looks like they were factory matched to...
    300 replies | 19542 view(s)
  • m_thompson's Avatar
    May 14th, 2017, 12:03 PM
    m_thompson replied to a thread PDP-12 restoration in DEC
    Dawson, This is what the PDP-12 at the RICM looks like. You can see what the second core stack looks like. Ours has more A (amber) cards because...
    12 replies | 523 view(s)
  • m_thompson's Avatar
    May 14th, 2017, 11:56 AM
    m_thompson replied to a thread PDP 11/45, Part 5 in DEC
    I have had the same experience reforming capacitors in DEC power supplies. The three large ones in the PDP-12 power supply cost about $225 each to...
    300 replies | 19542 view(s)
  • MattisLind's Avatar
    May 14th, 2017, 10:57 AM
    MattisLind replied to a thread RQDX1 and RQDX2 woes.. in DEC
    So I did some more research into this myself. What are the differences between a RQDX1 and RQDX2. Hardware The etch has changed but not so...
    2 replies | 212 view(s)
  • m_thompson's Avatar
    May 13th, 2017, 04:29 PM
    m_thompson replied to a thread PDP-12 restoration in DEC
    Dawson, The S/N 167 that you found is for memory subsystem. There should be more serial number tags on the cabinet near the top hinge for the...
    12 replies | 523 view(s)
  • m_thompson's Avatar
    May 13th, 2017, 03:57 PM
    m_thompson replied to a thread PDP-8/I at the RICM in DEC
    Charles Lasner visited the RICM yesterday and we had a chance to try the latest version of his P?S8 operating system on the PDP-8/I. It is a very...
    6 replies | 439 view(s)
  • m_thompson's Avatar
    May 13th, 2017, 03:53 PM
    m_thompson replied to a thread PDP 11/45, Part 5 in DEC
    Unfortunately the feeling that you get when some ancient device is brought back among the living is quite addictive. It is likely that will not be...
    300 replies | 19542 view(s)
  • m_thompson's Avatar
    May 13th, 2017, 03:51 PM
    m_thompson replied to a thread RK11-C / RK05 restore in DEC
    Very cool! I wonder if yours is the only one working?
    51 replies | 3611 view(s)
  • MattisLind's Avatar
    May 13th, 2017, 10:59 AM
    MattisLind started a thread RQDX1 and RQDX2 woes.. in DEC
    Hello RQDX1 and RQDX2 experts! I have a BA23 chassis with a 11/23 CPU some memory and then a choice of a RQDX1 and RQDX2 controller. I have a...
    2 replies | 212 view(s)
  • MattisLind's Avatar
    May 13th, 2017, 10:28 AM
    MattisLind replied to a thread PDP-12 restoration in DEC
    Nice machine! As far as I understand the amount of memory in these machine depend on the configuration. The machine we have is configured with 4k...
    12 replies | 523 view(s)
  • m_thompson's Avatar
    May 10th, 2017, 08:37 AM
    Too bad. :-(
    40 replies | 2698 view(s)
  • m_thompson's Avatar
    May 10th, 2017, 03:35 AM
    The core memory stack is worth keeping.
    40 replies | 2698 view(s)
  • MattisLind's Avatar
    May 8th, 2017, 11:12 PM
    MattisLind started a thread Decmate II on Ebay US. in DEC
    Nice looking Decmate II for someone in Pennsylvania, US: http://www.ebay.com/itm/162505157091. Not mine of course. Running and with a lot of...
    0 replies | 126 view(s)
  • MattisLind's Avatar
    May 3rd, 2017, 01:27 AM
    In absence of replies I took a closer look at the card and quite soon got that the card is purely 16 bit. The switches controls which 8k segments are...
    2 replies | 198 view(s)
  • m_thompson's Avatar
    April 30th, 2017, 05:48 AM
    Much of the vintage equipment used in HCF came from the RICM. Other props were provided by the Vintage Computer Federation, Living Computers Museum +...
    2 replies | 269 view(s)
  • m_thompson's Avatar
    April 30th, 2017, 05:41 AM
    m_thompson replied to a thread Plessey Peripheral System in DEC
    The RICM has a Plessey 6742/0 that has some of the same boards as your system. It runs and boots RSTS, but we haven't done much with it....
    2 replies | 217 view(s)
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About m_thompson

Basic Information

About m_thompson
Biography:
Volunteer at the RICM. Working on a 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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