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  • m_thompson's Avatar
    Yesterday, 04:01 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We measured the input and output signals of the bad B131 module and the adjacent good modules. On the bad B131 module the SUM output on pin V was a...
    28 replies | 1614 view(s)
  • Lou - N2MIY's Avatar
    Yesterday, 03:00 AM
    The Gotek works out of the box on the RQDX3 as an RX33. There was a thread here a few years back that quite a few of us participated in. We also...
    3 replies | 135 view(s)
  • wa2flq's Avatar
    March 12th, 2019, 06:07 AM
    I haven't run an VT100 emulator on a windows machine in a while, but the following are the typical things I check. Make sure the...
    22 replies | 2023 view(s)
  • m_thompson's Avatar
    March 11th, 2019, 03:59 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    The attached image shows the organization of the PDP-9 processor. Since the stuck bit-9 shows up in all of the registers the problem was most likely...
    28 replies | 1614 view(s)
  • m_thompson's Avatar
    March 10th, 2019, 06:44 AM
    Where is the museum located?
    2 replies | 107 view(s)
  • m_thompson's Avatar
    March 10th, 2019, 06:19 AM
    Yesterday, while digging through a box of PDP-9 documentation at the RICM, I found a TU60 tape with PDP-11 software on it.
    7 replies | 304 view(s)
  • Lou - N2MIY's Avatar
    March 9th, 2019, 06:51 AM
    Another factor that is pulling the value of your Rainbow down Alan, is that it also likely lacks the color graphics option. Since you only have the...
    7 replies | 286 view(s)
  • Lou - N2MIY's Avatar
    March 8th, 2019, 03:14 PM
    This is almost as bare bones as a system could get. It was a CAPS-11 system. CAPS-11 is really slow, because the TU60 is really slow. You'll see...
    7 replies | 304 view(s)
  • m_thompson's Avatar
    March 8th, 2019, 07:11 AM
    That would be a fun restoration project. Not such a bad price.
    7 replies | 304 view(s)
  • Lou - N2MIY's Avatar
    March 8th, 2019, 02:20 AM
    That is about what I was thinking as well. Anyone really wanting a Rainbow will wait / pay for a machine with Drive W:. Good luck finding the option...
    7 replies | 286 view(s)
  • Lou - N2MIY's Avatar
    March 5th, 2019, 04:48 PM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    So after sorting through a bunch more floppies, I was able to come up with about six error-free sides to start with. The process involved punching...
    16 replies | 733 view(s)
  • m_thompson's Avatar
    March 3rd, 2019, 06:11 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We powered up the DEC PDP-9 on Saturday and tried some simple functions. We can write/read core, and executed back-to-back JMP instructions. Since...
    28 replies | 1614 view(s)
  • Lou - N2MIY's Avatar
    March 3rd, 2019, 04:49 AM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    The RX02 was all DEC, just like the RX50. Some earlier RX01 drives have transports that were made by CalComp, but the surrounding sheetmetal and...
    16 replies | 733 view(s)
  • Lou - N2MIY's Avatar
    March 2nd, 2019, 02:11 PM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    We made some progress today. I made my own BC26P, which connects two RX drives to the DECMate. I connected two teacart RX02 drives and was able to...
    16 replies | 733 view(s)
  • wa2flq's Avatar
    March 1st, 2019, 06:39 PM
    Compare the results of a SHOW CONFIG from the XM boot with the contents of the XM.mac file. There is a mismatch in configuration options,...
    4 replies | 233 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 05:52 AM
    Thanks!
    30 replies | 2145 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 05:14 AM
    jackrubin replied to a thread PDP-9 at the RICM in DEC
    Whoops - missed the edit window - and also here: http://www.computerarium.org/doku/doku.php?id=rk05_disk_drives
    28 replies | 1614 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 04:49 AM
    Please flip the bags over so we can see the part numbers!
    30 replies | 2145 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 04:39 AM
    jackrubin replied to a thread PDP-9 at the RICM in DEC
    Mmm ... maybe time for a new thread? Or this old one - http://www.vcfed.org/forum/showthread.php?49142-RK05-RK8E-Restoration
    28 replies | 1614 view(s)
  • m_thompson's Avatar
    March 1st, 2019, 03:44 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I used self adhesive foam weather strip that I bought at the local hardware store. Two layers of 3/4" x 7/16" worked for the blower. One layer of...
    28 replies | 1614 view(s)
  • Lou - N2MIY's Avatar
    February 28th, 2019, 04:24 PM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    The photos of the keyboard shelf are great. I have never seen it before in detail. I like how it extends and retracts. You are in luck, the parts...
    16 replies | 733 view(s)
  • Lou - N2MIY's Avatar
    February 27th, 2019, 04:58 PM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    He should just be happy that his kid has interest in history of technology. Any parent today should be happy that their kid would want to play with...
    16 replies | 733 view(s)
  • Lou - N2MIY's Avatar
    February 27th, 2019, 03:34 PM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    I would not call it big and I have two of them. As far as value goes, there was a thread last week about that, so go see my comments there. However I...
    16 replies | 733 view(s)
  • m_thompson's Avatar
    February 27th, 2019, 07:54 AM
    Those are 3.2mm, the only ones that we have. https://schroff.nvent.com/en/schroff/69004-125
    6 replies | 261 view(s)
  • m_thompson's Avatar
    February 27th, 2019, 04:01 AM
    That looks very nice. My employer make LEDs that would be perfect for this application, but unfortunately they are quite expensive....
    6 replies | 261 view(s)
  • Lou - N2MIY's Avatar
    February 25th, 2019, 03:40 PM
    Bill, The images are here: http://www.pdp8.net/images/images/os8/DECmate_I.shtml . I contributed the diagnostic disk. My keyboard shelf is not...
    6 replies | 497 view(s)
  • Lou - N2MIY's Avatar
    February 25th, 2019, 03:31 PM
    Lou - N2MIY replied to a thread RQDX3 Low Level Format in DEC
    Peter, See US Patent 4,434,487. Also, you can study the listing for ZRQC??. The last version that is nicely commented is the listing of ZRQCE0....
    8 replies | 452 view(s)
  • Lou - N2MIY's Avatar
    February 23rd, 2019, 11:57 AM
    I like my VT278 decimates very much. I have two of the setups that Bill has pictured above. Here is a photo of one of mine:...
    6 replies | 497 view(s)
  • jackrubin's Avatar
    February 23rd, 2019, 08:47 AM
    jackrubin replied to a thread PDP-9 at the RICM in DEC
    Vince has already done the I/O cables, both "original" style and an updated version using ethernet cable to avoid crosstalk. Regardless, my vote...
    28 replies | 1614 view(s)
  • m_thompson's Avatar
    February 21st, 2019, 09:53 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Those are the mating connectors for the power cords on the CRAY, so we didn't care what the donor did. We were just happy to get the very expensive...
    28 replies | 1614 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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