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  • m_thompson's Avatar
    Yesterday, 03:42 PM
    m_thompson replied to a thread Keronix 16KW core memory for PDP-8/E,F,M in DEC
    The PDP-8/m in the ECRM scanner that the RICM just got has a 16k Keronix core in it. I will dig through the boxes of documentation to see if we got...
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    6 replies | 526 view(s)
  • m_thompson's Avatar
    Yesterday, 03:43 AM
    m_thompson replied to a thread PDP-8/m Powered OCR Scanner in DEC
    We are just learning about the scanner. One article that I found said that they were often used by newspapers to read want-ad forms that were written...
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    6 replies | 179 view(s)
  • Lou - N2MIY's Avatar
    Yesterday, 03:01 AM
    Lou - N2MIY replied to a thread PDP-8/m Powered OCR Scanner in DEC
    Those 8" drives in the ad are the ones I saw in the original photo in the upper left (not upper right as I had written earlier). From the ad, it...
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    6 replies | 179 view(s)
  • Lou - N2MIY's Avatar
    September 24th, 2017, 05:23 PM
    Lou - N2MIY replied to a thread PDP-8/m Powered OCR Scanner in DEC
    Perhaps you can tell us a little more about exactly what it did? There only appears to be a papertape reader/punch (unless those 8" drives in the far...
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    6 replies | 179 view(s)
  • m_thompson's Avatar
    September 24th, 2017, 04:01 PM
    m_thompson started a thread PDP-8/m Powered OCR Scanner in DEC
    The RICM just did a road trip to Montreal to get an ECRM OCR Scanner that is powered by a PDP-8/m. We got lots of documentation with the system, so...
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    6 replies | 179 view(s)
  • Lou - N2MIY's Avatar
    September 19th, 2017, 02:58 AM
    Lou - N2MIY replied to a thread How were PDP-8 networked? in DEC
    Sherman, I still have the manual and prints. I plan to scan them today. I should then send them to David G. or bitsavers for archiving ... ...
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    17 replies | 1798 view(s)
  • m_thompson's Avatar
    September 5th, 2017, 03:47 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    What is the next project?
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    61 replies | 2356 view(s)
  • Silent700's Avatar
    September 4th, 2017, 08:44 AM
    Silent700 started a thread VCF Midwest: (Not Even) One Week to Go! in Events and Organizations
    Hello vintage computer fans! According to the official vcfmw.org counter, we have just shy of five days to go until the 12th annual Vintage...
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    2 replies | 85 view(s)
  • m_thompson's Avatar
    September 3rd, 2017, 07:52 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    I emailed you an M8330 revision
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    September 1st, 2017, 03:42 PM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    This is what I do. If you have two people, the second person can keep the needle-nose pliers ready, and when the solder is melted, grab the pin and...
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    September 1st, 2017, 03:39 PM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    One of the theories is that the very early TTL parts didn't have a passivation layer to protect the die. The early plastic didn't keep the moisture...
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    61 replies | 2356 view(s)
  • wa2flq's Avatar
    September 1st, 2017, 12:04 PM
    wa2flq replied to a thread pdp-8/e and RX01 restoration. in DEC
    With regards to 7440 and 7474 chips, is it known why these chips fail more than others? Is it vendor specific, or some more generic manufactoring...
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    September 1st, 2017, 03:37 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    Don't give up. You can fix it.
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    August 31st, 2017, 03:40 PM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    Pull the boards, clean the gold fingers and backplane connector contacts, and reassemble. I use Deoxit with great results. Farnell has lots of...
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    August 31st, 2017, 09:46 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    Did you verify the contents of the memory locations 5015-5026? After the CAM instruction is E39/5, E39/7, E39/9 and E39/11 should all be in the...
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    August 31st, 2017, 08:05 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    The MQ06 L signal goes to a lot of other devices. It would be worthwhile looking at the E39 pin 9 before you replace E39.
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    August 31st, 2017, 03:47 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    Sounds like a plan. There are some Signetics 8271 parts on eBay for $4.99 each. You should buy some spares.
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    61 replies | 2356 view(s)
  • Silent700's Avatar
    August 29th, 2017, 02:52 PM
    Silent700 replied to a thread VCF Midwest 12 in Events and Organizations
    I am pleased to announce that the 12th year of the Vintage Computer Festival Midwest will feature a commemorative battery-powered "badge" computer,...
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    3 replies | 762 view(s)
  • m_thompson's Avatar
    August 28th, 2017, 06:47 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    I usually press LA, CLEAR, START with SS on. I think that MA 0716 has 7111 in it instead of the expected 7100. You also need to press EXAM...
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    August 28th, 2017, 04:27 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    Looks good so far, except for the second step I expected to see 7 0100 should contain 7770 and 0026 should contain 0010. The K is the standard...
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    August 28th, 2017, 03:54 AM
    m_thompson replied to a thread pdp-8/e and RX01 restoration. in DEC
    The actual halt is at 0723, so D0AB failed the TAD TEST 21. You should be able to start it at 0715, single step, and watch the contents of the AC....
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    61 replies | 2356 view(s)
  • m_thompson's Avatar
    August 28th, 2017, 03:36 AM
    m_thompson replied to a thread OS/8 Fortran in DEC
    I found some example FORTRAN-IV programs on pdp-8.net and gave them a try on SIMH. They worked OK and displayed the expected output. I tried them...
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    10 replies | 410 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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DEC extender adapter for over-the-top OMNIBUS boards

by jackrubin on June 30th, 2017 at 01:50 PM
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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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