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  • jackrubin's Avatar
    Yesterday, 09:13 AM
    jackrubin replied to a thread Goodbye Cctech Mailing List in DEC
    +1, Mike - and even better, it was easier to follow as a narrative in the digest than in a series of one-off emails.
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    12 replies | 416 view(s)
  • m_thompson's Avatar
    Yesterday, 08:36 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    It was a little messy after the move, but now the PDP-9 has some nice company.
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    6 replies | 161 view(s)
  • m_thompson's Avatar
    Yesterday, 08:32 AM
    m_thompson replied to a thread Goodbye Cctech Mailing List in DEC
    I thought that your 11/45 thread was one of the best on Cctech in a very long time. I don't think that I could have solved the problem if the diags...
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    12 replies | 416 view(s)
  • m_thompson's Avatar
    Yesterday, 08:26 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We did have it running for a long time, but I don't think that the warehouse environment helps the reliability. The PDP-8/I and the PDP-12...
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    6 replies | 161 view(s)
  • m_thompson's Avatar
    Yesterday, 08:17 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    The original lab space was about 800 sq/ft, and the new space is about 2x the original space. It looks like complete chaos right now after the move,...
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    6 replies | 161 view(s)
  • MattisLind's Avatar
    February 16th, 2019, 05:24 AM
    MattisLind replied to a thread PDP-9 at the RICM in DEC
    Congratulations to the new space! Much easier to work with it when it is in a heated space. It will be very interesting to follow your work on...
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    6 replies | 161 view(s)
  • jackrubin's Avatar
    February 16th, 2019, 03:22 AM
    jackrubin replied to a thread Goodbye Cctech Mailing List in DEC
    I subscribe to the daily digest which means I just get one email a day, organized with a table of contents and then individual messages to follow....
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    12 replies | 416 view(s)
  • m_thompson's Avatar
    February 15th, 2019, 10:42 AM
    m_thompson replied to a thread Testing a DEQNA (M7504) board in DEC
    1.3.3.1 Bootstrap - The DEQNA contains a 4-Kbyte ROM (BD ROM - Boot/Diagnostic ROM) that host software can read. The BD ROM contains PDP-II code...
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    8 replies | 117 view(s)
  • m_thompson's Avatar
    February 15th, 2019, 10:38 AM
    m_thompson started a thread PDP-9 at the RICM in DEC
    Tomorrow the RICM is moving the Lab to new+ space that is about twice the current size. That means that we can haul some more interesting items out...
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    6 replies | 161 view(s)
  • m_thompson's Avatar
    February 15th, 2019, 09:50 AM
    m_thompson replied to a thread Testing a DEQNA (M7504) board in DEC
    There is a lot of info on the ROM and ZQNA diags in this manual: http://manx-docs.org/collections/antonio/dec/cmiv5rm4.pdf And DEQNA diags in this...
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    8 replies | 117 view(s)
  • m_thompson's Avatar
    February 14th, 2019, 09:52 AM
    m_thompson replied to a thread Intel System 80 SBC 660 Multibus computer with some Photometrics cards in Other
    I think that I have the same processor board in one of my Multibus systems.
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    5 replies | 156 view(s)
  • m_thompson's Avatar
    February 13th, 2019, 05:17 PM
    m_thompson replied to a thread Gt40 in DEC
    Mattis, Thanks for the help. Our museum is moving to a new space in the building across the parking lot. The first system to move will be the...
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    11 replies | 534 view(s)
  • MattisLind's Avatar
    February 13th, 2019, 12:02 PM
    MattisLind replied to a thread Gt40 in DEC
    If the terminator is a M930 it can be hard to see at the first glance. They are quite short... AB3 and AB5 is the same slots for the terminator as...
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    11 replies | 534 view(s)
  • m_thompson's Avatar
    February 13th, 2019, 09:30 AM
    m_thompson replied to a thread Gt40 in DEC
    We would need to remove the M7013 VT11 Display Control & Character Generator to reveal the KM11 slot, if it has not been rewired for use with the...
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    11 replies | 534 view(s)
  • MattisLind's Avatar
    February 13th, 2019, 05:25 AM
    MattisLind replied to a thread Gt40 in DEC
    Did you try it with or without UNIBUS terminators? The other day I forgot both terminators and the machine was pretty much dead. Installing them and...
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    11 replies | 534 view(s)
  • m_thompson's Avatar
    February 11th, 2019, 01:59 PM
    m_thompson replied to a thread Gt40 in DEC
    The console on the 11/05 is unresponsive, so we have some debugging to do. I was thinking of buying one of the KM11 replicas to aid in debugging....
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    11 replies | 534 view(s)
  • MattisLind's Avatar
    February 10th, 2019, 11:10 PM
    MattisLind replied to a thread Need some help getting a DEC VT100 working in DEC
    When there is no beep at startup my experience is that the low ROM is bad. If you have the AVO this ROM can be replaced with a ordinary 2716. Another...
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    3 replies | 263 view(s)
  • MattisLind's Avatar
    February 8th, 2019, 05:12 AM
    MattisLind replied to a thread A lot of flip chips saved from being scrapped... in DEC
    Here is the module utilization for the TC11: Even the number of boards match very well. Missing just one M149 board.
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    6 replies | 466 view(s)
  • MattisLind's Avatar
    February 8th, 2019, 04:43 AM
    MattisLind replied to a thread Backplanes DD11A and MM11F in DEC
    If you add a dash, MM11-F and DD11-A, then google is a bit more friendly: For example http://gunkies.org/wiki/MM11-E_and_MM1-F_core_memories and...
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    1 replies | 113 view(s)
  • MattisLind's Avatar
    February 7th, 2019, 12:41 AM
    MattisLind replied to a thread A lot of flip chips saved from being scrapped... in DEC
    Looks like all the flip chips from a TC11 is in there. Sad that backplane is gone.
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    6 replies | 466 view(s)
  • jackrubin's Avatar
    February 6th, 2019, 07:37 PM
    jackrubin replied to a thread A lot of flip chips saved from being scrapped... in DEC
    Those G888's will go nicely in the TU56 you're looking for as well. Nice find.
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    6 replies | 466 view(s)
  • m_thompson's Avatar
    February 6th, 2019, 05:09 PM
    m_thompson replied to a thread A lot of flip chips saved from being scrapped... in DEC
    Almost enough parts to build a TU10...
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    6 replies | 466 view(s)
  • MattisLind's Avatar
    February 6th, 2019, 08:35 AM
    MattisLind replied to a thread HP 1000 / 21MX / 2108 Mincomputer on fleabay in Vintage Computer Items For Sale or Trade
    Not much in terms of I/O as far as I can see. There is one single BACI board in there. I/O is shown in one of the last pictures.
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    5 replies | 255 view(s)
  • m_thompson's Avatar
    February 4th, 2019, 04:39 AM
    m_thompson replied to a thread Digital 32KW RAM pcb in DEC
    How about adding two serial ports to the next version?
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    14 replies | 617 view(s)
  • m_thompson's Avatar
    February 3rd, 2019, 06:12 PM
    m_thompson replied to a thread Gt40 in DEC
    We reformed the capacitors in the power supply and connected a DC power supply to the input capacitors. The +15, +5, and -15V regulators all worked...
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    11 replies | 534 view(s)
  • m_thompson's Avatar
    February 3rd, 2019, 06:07 PM
    m_thompson replied to a thread PDP-8L Modules in DEC
    I modified mine to use a USB/SPI cable and wrote Windows software to read the same test files and run the tester.
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    7 replies | 315 view(s)
  • MattisLind's Avatar
    February 3rd, 2019, 07:23 AM
    MattisLind replied to a thread PDP-8L Modules in DEC
    Depending on what condition your machine is in you might want one like this: An M-series module tester. Vince Slyngstad makes them based on...
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    7 replies | 315 view(s)
  • m_thompson's Avatar
    February 3rd, 2019, 05:34 AM
    m_thompson replied to a thread PDP-8L Modules in DEC
    The RICM made a detailed blog about restoring their 8/L.\ You can read about it here.
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    7 replies | 315 view(s)
  • MattisLind's Avatar
    February 3rd, 2019, 01:12 AM
    MattisLind replied to a thread 11/05-10 owners: try an experiment for me please? in DEC
    Mine show 000000 at address 177776.
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    2 replies | 190 view(s)
  • MattisLind's Avatar
    February 2nd, 2019, 10:45 PM
    MattisLind replied to a thread KDF11 board question in DEC
    The KEF11-B CIS microcode is a double size module so you could not have it simultaneously with the KEF11-A floating point option on the KDF11-A. The...
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    4 replies | 213 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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