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  • m_thompson's Avatar
    Today, 03:56 PM
    m_thompson replied to a thread RK05 fan blower motor in DEC
    As a separate project we should determine why the blower motors are going bad. I have three of them where the internal connection between the start...
    17 replies | 540 view(s)
  • m_thompson's Avatar
    Today, 03:44 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Yes, it would be interesting to see how yours is wired.
    53 replies | 6063 view(s)
  • m_thompson's Avatar
    Yesterday, 06:39 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Yesterday we wired the DC power to the TC02 DECtape controller (thanks Charles Lasner) and the two TU55 DECtape drives that we recently installed in...
    53 replies | 6063 view(s)
  • m_thompson's Avatar
    Yesterday, 05:46 AM
    m_thompson replied to a thread What is DB08? in DEC
    it is an interprocessor buffer to interconnect two PDP-8 systems, or maybe your PDP-9 and a PDP-8. You need to find the 08-H8PA-D PDP-8 DB08...
    1 replies | 97 view(s)
  • jackrubin's Avatar
    June 15th, 2019, 03:44 AM
    I bought my DM-2's from Halted/HSC before they went out of business (they closed in early 2019), where they were listed as G797-1. This is also where...
    11 replies | 344 view(s)
  • wa2flq's Avatar
    June 14th, 2019, 07:33 PM
    wa2flq replied to a thread PDP-11/34A interrupt problem in DEC
    Congratulations! Learned a few new things myself. Try a .DIFF/BIN RT11SJ.40 RT11SJ.060 and the differences and locations will be quickly...
    28 replies | 536 view(s)
  • jackrubin's Avatar
    June 14th, 2019, 04:39 PM
    I've been through my box of DM-1 and DM-2 diodes and can't really see any difference between them. I'm still trying to find specs on them, but no...
    11 replies | 344 view(s)
  • wa2flq's Avatar
    June 14th, 2019, 10:13 AM
    wa2flq replied to a thread PDP-11/34A interrupt problem in DEC
    It definitely possible. The console addresses are easily patchable w/o having to generate a new system. See...
    28 replies | 536 view(s)
  • jackrubin's Avatar
    June 14th, 2019, 07:05 AM
    jackrubin replied to a thread SerialDisk sans BSW in DEC
    That would be great - please send copies to me and Kyle. Thanks!
    2 replies | 92 view(s)
  • m_thompson's Avatar
    June 14th, 2019, 04:24 AM
    m_thompson replied to a thread SerialDisk sans BSW in DEC
    Charles modified the handler so it would run on the RICM PDP-12, so it should run on your 8/I. I believe that Kyle has a copy of the...
    2 replies | 92 view(s)
  • jackrubin's Avatar
    June 13th, 2019, 05:32 PM
    Arrgh!! I couldn't stand the suspense, so I placed my own order with JLCPCB. There should be 5 boards on this side of the ocean some time next...
    105 replies | 9847 view(s)
  • jackrubin's Avatar
    June 13th, 2019, 04:40 PM
    jackrubin started a thread SerialDisk sans BSW in DEC
    I'm vaguely aware that SerialDisk has been modified to remove the original BSW dependency that limited it's use to post 8/E machines. There was also...
    2 replies | 92 view(s)
  • wa2flq's Avatar
    June 13th, 2019, 03:36 PM
    wa2flq replied to a thread PDP-11/34A interrupt problem in DEC
    I see in your later postings that you have made good progress in sorting out the various questions or issues - congrats. In regards to the question...
    28 replies | 536 view(s)
  • wa2flq's Avatar
    June 12th, 2019, 02:51 PM
    wa2flq replied to a thread PDP-11/34A interrupt problem in DEC
    Note: In addition to placing 0 in the vector and status word for any interrupt you are testing, place a 0 starting at address 0. That will...
    28 replies | 536 view(s)
  • wa2flq's Avatar
    June 12th, 2019, 11:48 AM
    wa2flq replied to a thread PDP-11/34A interrupt problem in DEC
    The 11/34 should clear PSW after power startup or Control - INIT from the programmers console. FYI - the 11/34 has both the addressable PSW and the...
    28 replies | 536 view(s)
  • jackrubin's Avatar
    June 12th, 2019, 11:27 AM
    Always a good event - see you in Chicago! http://vcfmw.org for more info, pictures of past events, etc.
    6 replies | 156 view(s)
  • wa2flq's Avatar
    June 12th, 2019, 07:58 AM
    wa2flq replied to a thread PDP-11/34A interrupt problem in DEC
    Enable the LTC using just the Console DL11-W board. Use address 177546 instead of 176500 and vector 100 instead of 300. Enable the RTC switches....
    28 replies | 536 view(s)
  • jackrubin's Avatar
    June 12th, 2019, 03:11 AM
    Yessir - works for me! Thanks
    105 replies | 9847 view(s)
  • m_thompson's Avatar
    June 11th, 2019, 09:45 AM
    I have an early revision EAE board set that I need to modify to work in my newer 8/e, so I could also use a more readable set of prints.
    10 replies | 262 view(s)
  • jackrubin's Avatar
    June 11th, 2019, 08:32 AM
    I'm happy to provide high-res scans of my board set if it would be helpful. I can also buzz out any connections that might not be clear on the scans...
    10 replies | 262 view(s)
  • jackrubin's Avatar
    June 11th, 2019, 07:52 AM
    I'm not sure what you've looked at, but Vince has a pretty clean set as well as good board photos -...
    10 replies | 262 view(s)
  • jackrubin's Avatar
    June 11th, 2019, 07:42 AM
    I just priced out a build at JLCPCB using your gerbers. Total cost to me, including shipping, would be $110 for five boards, so $22 each. I'm happy...
    105 replies | 9847 view(s)
  • jackrubin's Avatar
    June 9th, 2019, 02:11 PM
    Wonderful work! You've motivated to get back to work on a couple of threads that I had started a while back - correspondence with Prosser, Winkel...
    105 replies | 9847 view(s)
  • m_thompson's Avatar
    June 7th, 2019, 04:12 AM
    I can do that!
    11 replies | 344 view(s)
  • jackrubin's Avatar
    June 6th, 2019, 04:43 PM
    Mattis, I have a couple dozen of them; they were also used in the 8/I power supply, but jumpered to form a conventional 4-diode bridge. We...
    11 replies | 344 view(s)
  • m_thompson's Avatar
    June 6th, 2019, 08:02 AM
    The PDP-9 that I am working on has lots of 6-pin rectifier modules. They contain 4x diodes with 4x pins for the diodes, and 2x pins for a common...
    11 replies | 344 view(s)
  • jackrubin's Avatar
    June 3rd, 2019, 10:57 AM
    jackrubin replied to a thread Extended Bootloader Blues in DEC
    Responding point-by-point: 1) Yes, that is the program I loaded and ran, either manually or by clicking in 26 with the on-board push button. 2)...
    7 replies | 254 view(s)
  • jackrubin's Avatar
    June 3rd, 2019, 04:26 AM
    jackrubin replied to a thread Extended Bootloader Blues in DEC
    The new board has a pair of bright and shiny new Cypress CY62256NLL-70PXC chips, date code 1849. I've disabled them for most of my testing using the...
    7 replies | 254 view(s)
  • jackrubin's Avatar
    June 2nd, 2019, 02:29 PM
    I finally finished assembling my 32K+Bootloader combo card today and popped it into my newly revived 8/E, planning to start running MAINDECs. As a...
    7 replies | 254 view(s)
  • m_thompson's Avatar
    June 2nd, 2019, 08:52 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Sometimes the maintenance manuals are difficult to understand... Last week we when working on the PDP-9, we followed the System Adjustment...
    53 replies | 6063 view(s)
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About jackrubin

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About jackrubin
Biography:
Started computing in 1959 (GENIAC), still trying to figure things out
Location:
Wilmette, IL (north of Chicago)
Interests:
CP/M, PDP8 & 11, RTTY
Occupation:
Stay-at-home computer dad

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Recent Entries

DEC extender adapter for over-the-top OMNIBUS boards

by jackrubin on June 30th, 2017 at 01:50 PM
Quote Originally Posted by jackrubin View Post
Revision 2 just arrived - smaller board, no vias. Based on how hard I had to smack the connectors with the hammer, I've opened the holes up a little in the next batch. First cable set goes out for testing tomorrow.





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