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  • m_thompson's Avatar
    October 11th, 2018, 08:09 AM
    Mine was a lot more difficult to get running. One of the delay lines that was added by DEC as an ECO was ripped off the PCB. Vince gave me a flipchip...
    46 replies | 3740 view(s)
  • m_thompson's Avatar
    October 4th, 2018, 03:13 PM
    m_thompson replied to a thread Document scanning in DEC
    Vince has added schematics that I sent him, so I am sure that he would like to have copies of yours. I think that the documents are easier to use...
    5 replies | 269 view(s)
  • MattisLind's Avatar
    October 4th, 2018, 10:53 AM
    MattisLind replied to a thread Document scanning in DEC
    Here is a PDF with schematics for A704, rev C, A502 (I misread it as A302) rev C, A 603 rev B and A121 rev B. The A502 is already on Vincents page...
    5 replies | 269 view(s)
  • m_thompson's Avatar
    October 2nd, 2018, 08:14 AM
    m_thompson replied to a thread REMEX Paper Tape reader in DEC
    All of my toys are in my cellar. The dehumidifier keeps it 40%-60% during the summer, and it will go below 40% in the winter. In the summer it rarely...
    33 replies | 978 view(s)
  • m_thompson's Avatar
    October 2nd, 2018, 03:47 AM
    m_thompson replied to a thread REMEX Paper Tape reader in DEC
    In getting and keeping an 8/I and a PDP-12 running we have replaced LOTS of 7474 ICs, and quite a few 7400, 7440, 7438. We have several tubes of new...
    33 replies | 978 view(s)
  • m_thompson's Avatar
    October 1st, 2018, 03:49 AM
    After you clean the heads, you can manually load them to make sure that nothing bad happens. The maintenance manual shows some jumpers that you can...
    46 replies | 3740 view(s)
  • m_thompson's Avatar
    September 26th, 2018, 03:35 AM
    m_thompson replied to a thread PDP Industrial Design in DEC
    You could also try some of the DEC groups on LinkedIn and Facebook.
    3 replies | 223 view(s)
  • MattisLind's Avatar
    September 25th, 2018, 11:21 AM
    I have some kind of IBM MCA 3270 board available for the cost of shipping from Sweden. IBM P/N 26F0191. Have no way of testing it, but it was pulled...
    0 replies | 63 view(s)
  • m_thompson's Avatar
    September 24th, 2018, 12:51 PM
    The RICM has one, http://www.ricomputermuseum.org/Home/equipment/data-general-aviion It hasn't been powered on in many years.
    11 replies | 1379 view(s)
  • MattisLind's Avatar
    September 24th, 2018, 02:57 AM
    It should be possible to get into ODT without RAM. Is the startup jumpers set to HALT or BOOT from 173000? I once had a SLU with a bad UART. It...
    10 replies | 523 view(s)
  • m_thompson's Avatar
    September 18th, 2018, 03:37 AM
    The difficult part about substituting a modern capacitor is the spacing between the screw terminals where the capacitor attaches to the PCB. There...
    14 replies | 996 view(s)
  • m_thompson's Avatar
    September 17th, 2018, 12:54 PM
    From the schematic, the power supply looks like a linear. It is an early design of a switcher that is very dependent on the size if the output...
    14 replies | 996 view(s)
  • m_thompson's Avatar
    September 17th, 2018, 08:55 AM
    I put the LT-Spice model of the H740 Power supply here.
    14 replies | 996 view(s)
  • m_thompson's Avatar
    September 17th, 2018, 03:53 AM
    m_thompson started a thread P?S/8 Operating System in DEC
    Charles Lasner visited the RICM last Saturday, and gave us a copy of the latest version of his P?S/8 operating system for the PDP-8. We used tool...
    1 replies | 227 view(s)
  • m_thompson's Avatar
    September 17th, 2018, 03:48 AM
    7x 12 bit GPIO boards? That is a lot of I/O. The power supply in that chassis won't work unless the output capacitors have more than 1000 uF of...
    14 replies | 996 view(s)
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