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  • m_thompson's Avatar
    November 10th, 2018, 05:04 PM
    Looks like you have the bootstraps covered.
    31 replies | 1546 view(s)
  • m_thompson's Avatar
    November 7th, 2018, 09:55 AM
    I think that you can create a BOM for the components on Digikey, and then share the BOM. I could then order the parts from Digikey using your BOM.
    31 replies | 1546 view(s)
  • m_thompson's Avatar
    November 7th, 2018, 04:47 AM
    Could you sell a kit containing the PCB with gold fingers and all of the components? I would like to have two, and maybe three. You could contact...
    31 replies | 1546 view(s)
  • m_thompson's Avatar
    November 6th, 2018, 02:00 PM
    m_thompson replied to a thread REMEX Paper Tape reader in DEC
    We ran into this at the RICM when we make a 20mA<->RS-232 adapter and tried to read images of Focal source files. Periodically Focal would do some...
    102 replies | 4245 view(s)
  • jackrubin's Avatar
    November 5th, 2018, 07:28 PM
    jackrubin replied to a thread MAINDECs, RIM and BIN in DEC
    Don, Thanks for the explanation - I saw the self modifying code you pointed out but didn't really grasp the full functionality. Very clever. I...
    3 replies | 161 view(s)
  • jackrubin's Avatar
    November 5th, 2018, 05:54 AM
    jackrubin started a thread MAINDECs, RIM and BIN in DEC
    I'm working on a "new" 8/E that came to me a few months ago. Yesterday, I ran through the acceptance MAINDECs but with a twist. I'm testing an...
    3 replies | 161 view(s)
  • jackrubin's Avatar
    November 4th, 2018, 03:07 PM
    jackrubin replied to a thread KL8e (M8650D) question in DEC
    Yes - Doug's pages are a great resource for these boards (M8650 and M8655). I've had complete success with the M8650 crystal upgrades and his various...
    4 replies | 232 view(s)
  • Lou - N2MIY's Avatar
    November 1st, 2018, 04:08 AM
    Lou - N2MIY replied to a thread Broken RLV12 in DEC
    So do you think there could be a problem with the DC006 counter at E88? I have not yet followed WC OFLW H off of sheet 2 to where it goes next, but I...
    13 replies | 700 view(s)
  • jackrubin's Avatar
    October 30th, 2018, 07:08 PM
    Github is a great place for sharing anything. You could also share your PCB designs at Oshpark, but using Github is vendor neutral. Take a look at...
    31 replies | 1546 view(s)
  • Lou - N2MIY's Avatar
    October 30th, 2018, 04:37 PM
    Lou - N2MIY replied to a thread Broken RLV12 in DEC
    I will mention a strange thing I have noticed on various RLV12s I have worked with over the years. For reasons I don't quite understand, I have...
    13 replies | 700 view(s)
  • m_thompson's Avatar
    October 30th, 2018, 08:59 AM
    m_thompson replied to a thread Broken RLV12 in DEC
    On my 8/e, I wrote some very small diags to test for specific issues. They let me test small parts of the board that I though were broken, and gave...
    13 replies | 700 view(s)
  • m_thompson's Avatar
    October 30th, 2018, 04:47 AM
    m_thompson replied to a thread Broken RLV12 in DEC
    The output of this diagnostic isn't very helpful. Usually they show you what they expect vs. what they found. On other repair projects I really...
    13 replies | 700 view(s)
  • Lou - N2MIY's Avatar
    October 29th, 2018, 06:51 PM
    Lou - N2MIY replied to a thread Broken RLV12 in DEC
    HNF is correct and should be set. Test 20 is the force HNF with read test. I do not see a listing for VRLBC0 available online. I also just...
    13 replies | 700 view(s)
  • m_thompson's Avatar
    October 29th, 2018, 04:25 PM
    m_thompson replied to a thread Broken RLV12 in DEC
    Oops, I am used to DEC systems that have a word size that is a multiple of 6 bits. HNF would imply that it expected a disk connected and working,...
    13 replies | 700 view(s)
  • m_thompson's Avatar
    October 29th, 2018, 08:58 AM
    m_thompson replied to a thread Broken RLV12 in DEC
    If I am interpreting the bits in the CS register (112200) correctly, the 11 is E3-E0 = Parity error abort (PAR ERR)
    13 replies | 700 view(s)
  • m_thompson's Avatar
    October 25th, 2018, 09:17 AM
    I made a modification to the OS/8 BOOT command to boot from the serialdisk.
    31 replies | 1546 view(s)
  • jackrubin's Avatar
    October 25th, 2018, 06:50 AM
    Bravo!
    31 replies | 1546 view(s)
  • m_thompson's Avatar
    October 25th, 2018, 05:19 AM
    Was that the serialdisk bootloader that you showed at the end of the video?
    31 replies | 1546 view(s)
  • wa2flq's Avatar
    October 22nd, 2018, 03:26 PM
    wa2flq replied to a thread Scored a KDJ11-A in DEC
    Happy to share what I know. Appendix B is expanded to include some information on the ASH ASHC instructions. There were some differences in the...
    7 replies | 520 view(s)
  • wa2flq's Avatar
    October 22nd, 2018, 10:32 AM
    wa2flq replied to a thread SCSI2SD and VMS 6.0 in DEC
    Do you have this patch (or one that supersedes it) installed? 1 KIT NAME: VAXSCSI03_061 2 KIT DESCRIPTION: 2.1 Version(s) of...
    7 replies | 540 view(s)
  • wa2flq's Avatar
    October 21st, 2018, 03:38 PM
    wa2flq replied to a thread Scored a KDJ11-A in DEC
    Congratulations. ODT on the KDJ11A requires 22bit addresses…even in 18bit backplanes. I just use 77777xxxx, as it drops any excess leading...
    7 replies | 520 view(s)
  • wa2flq's Avatar
    October 21st, 2018, 09:34 AM
    wa2flq replied to a thread Scored a KDJ11-A in DEC
    My standard gear is a KDJ11-A and UC07. My KDJ11 Jumpers are only W3 and W5. The diagnostic is pretty good at detecting problems local to the CPU...
    7 replies | 520 view(s)
  • wa2flq's Avatar
    October 18th, 2018, 03:21 PM
    wa2flq replied to a thread Trying to create TU58 image in DEC
    The UCL.DAT file is created when you first define a user command. If you don't have UCL.SAV on SY:, you won't be able to create or use user...
    4 replies | 325 view(s)
  • wa2flq's Avatar
    October 15th, 2018, 01:58 PM
    wa2flq replied to a thread SCSI2SD and VMS 6.0 in DEC
    I haven't run VMS6.0, but I do run VMS 5.5-2 and 7.3 on the same model with a V5 SCSI2SD, so I don't believe there is any reason why it should not...
    7 replies | 540 view(s)
  • jackrubin's Avatar
    October 13th, 2018, 05:57 AM
    Here's how the pros do it - https://www.youtube.com/watch?v=BFqNP8VqoPs Strange Parts has many cool videos about manufacturing in China - worth a...
    16 replies | 1439 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 02:50 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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