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  • wa2flq's Avatar
    June 21st, 2018, 06:35 AM
    Glad to hear that you were able to sort it out. In some cases if may be possible to patch the offending code. Alternately, especially if its a...
    3 replies | 188 view(s)
  • wa2flq's Avatar
    June 20th, 2018, 12:00 PM
    According to the RT11 System Message Manual ?VTCOM–F–Clock not running Explanation: You attempted to start VTCOM on a processor that does not...
    3 replies | 188 view(s)
  • wa2flq's Avatar
    June 18th, 2018, 01:33 PM
    wa2flq replied to a thread KDJ11-A in H9275-A in DEC
    I have used a H9275A OEM system with both the KDJ11-A or KDF11-B. The first decade the system it ran a commercial application. After that it has...
    7 replies | 233 view(s)
  • wa2flq's Avatar
    June 16th, 2018, 02:06 PM
    wa2flq replied to a thread SMS 11X PDP-23 rescue in DEC
    Yes, if you look at http://bitsavers.org/pdf/emulex/ you will find manuals for Emulex controllers. The SC0351002-J_SC03tech_Nov84.pdf describes the...
    11 replies | 529 view(s)
  • kenwickvs's Avatar
    June 16th, 2018, 11:23 AM
    Nice work, Peter. Which AVR uP have you chosen? -Ken
    13 replies | 479 view(s)
  • kenwickvs's Avatar
    June 16th, 2018, 10:01 AM
    Hello DECheads, Perhaps my google'ing skills are lacking, but I can't seem to come up with any design worthy documentation for the FPJ11, the...
    0 replies | 65 view(s)
  • kenwickvs's Avatar
    June 16th, 2018, 09:40 AM
    Hi Peter, Funny, I was just looking at the schematics for a DCJ11-based SBC I designed way back in 1990. It used many Lattice GAL devices from...
    13 replies | 479 view(s)
  • kenwickvs's Avatar
    June 15th, 2018, 07:07 PM
    Hi Peter, I'm just getting back on the DCJ11 design, so I haven't picked out level converters just yet. It's most likely an issue with space,...
    13 replies | 479 view(s)
  • kenwickvs's Avatar
    June 15th, 2018, 02:45 PM
    Oh, that's right, you're in Rhode Island :-) Thanks for the info, Michael.
    19 replies | 649 view(s)
  • kenwickvs's Avatar
    June 15th, 2018, 08:23 AM
    Is the AM26S10 the one you're referring to? -Ken PS, Don't you have a running PDP with a loaded Qbus @ RICM?
    19 replies | 649 view(s)
  • kenwickvs's Avatar
    June 15th, 2018, 07:32 AM
    A quick thought relating to Al Kossow's post early in this thread, it would be very useful to see some captured scope traces (DAL lines would be...
    19 replies | 649 view(s)
  • kenwickvs's Avatar
    June 15th, 2018, 07:21 AM
    It seems that there is no standard parts that meet entirely both driver and receiver specifications as discussed 10-years ago here:...
    19 replies | 649 view(s)
  • kenwickvs's Avatar
    June 14th, 2018, 07:58 PM
    Hi Peter, eeguru, Michael et al, For reference in this thread following is the original electrical specification for the Qbus from the "PDP11 Bus...
    19 replies | 649 view(s)
  • wa2flq's Avatar
    June 14th, 2018, 04:32 PM
    wa2flq replied to a thread SMS 11X PDP-23 rescue in DEC
    That sounds familiar. Mine was a single board with provisions for only 1 drive cable if I'm remembering correctly. I'm pretty sure it handled...
    11 replies | 529 view(s)
  • wa2flq's Avatar
    June 14th, 2018, 03:09 PM
    wa2flq replied to a thread SMS 11X PDP-23 rescue in DEC
    Hi Peter, I mistyped - it should have said "RK06/RK07". While DEC never made a Qbus controller for their RK06/RK07 drives, many third party...
    11 replies | 529 view(s)
  • wa2flq's Avatar
    June 13th, 2018, 07:54 PM
    wa2flq replied to a thread SMS 11X PDP-23 rescue in DEC
    I never trusted the advertisements back in those days for important details, but that certainly stretches the term "transparent". I do recall...
    11 replies | 529 view(s)
  • wa2flq's Avatar
    June 13th, 2018, 04:30 PM
    wa2flq replied to a thread SMS 11X PDP-23 rescue in DEC
    To bootstrap the box with RT-11 on a floppy (you need to source some scratch media) suggest you look at the PDP11GUI with its disk image features. ...
    11 replies | 529 view(s)
  • wa2flq's Avatar
    June 12th, 2018, 12:25 PM
    Congratulations are getting this up and running. From the pictures it looks like a nice sweet system. Jerry
    28 replies | 2489 view(s)
  • kenwickvs's Avatar
    June 11th, 2018, 04:23 AM
    I created a public repository on Github titled "Qbus-Interface-Design" here: https://github.com/kenwick/Qbus-Interface-Design Obviously,...
    19 replies | 649 view(s)
  • kenwickvs's Avatar
    June 10th, 2018, 09:11 AM
    Hello again DECheads, I've noticed what seems to be an increasing interest in prototyping hardware for the Qbus. I, for one, am tinkering on a...
    19 replies | 649 view(s)
  • wa2flq's Avatar
    June 9th, 2018, 09:08 PM
    wa2flq replied to a thread MicroVax 3100-96 boot problems in DEC
    See MicroVAX 3100 Model 85/95/96 Troubleshooting and Diagnostic Information EK-A0719-TM. Though I have not seen detail published around the...
    6 replies | 248 view(s)
  • kenwickvs's Avatar
    June 9th, 2018, 02:43 PM
    Peter, I think the approach to doing a 4, 8 or more port DL compatible design is to choose a modern and cheap FPGA as there are a lot of choices...
    13 replies | 479 view(s)
  • wa2flq's Avatar
    June 8th, 2018, 04:23 PM
    wa2flq replied to a thread MicroVax 3100-96 boot problems in DEC
    Congrats on getting this machine powered up. It was one of the last VAX machines in this form factor. An NVAX chip with about 38 vups, but limited...
    6 replies | 248 view(s)
  • kenwickvs's Avatar
    June 8th, 2018, 05:34 AM
    Hi Cruff, I'm glad to see your interest in FPGA technology. It's amazing how much affordable logic you can get nowdays. You could most likely...
    13 replies | 479 view(s)
  • kenwickvs's Avatar
    June 8th, 2018, 05:26 AM
    Hello Peter, The work you've done on your system is indeed impressive and your choice of implementation of "DL" serial interfaces is clever. My goal...
    13 replies | 479 view(s)
  • kenwickvs's Avatar
    June 7th, 2018, 07:37 PM
    Hi DEC Forum Folks, As a part of my earlier posted "World's Fastest Real DCJ11" project I recently realized that I needed a few DL software...
    13 replies | 479 view(s)
  • wa2flq's Avatar
    May 30th, 2018, 04:32 PM
    wa2flq replied to a thread KDJ11-B wich Backplane? in DEC
    You need a backplane with a Q/C-D layout, sometimes called CD interconnect. See http://gunkies.org/wiki/CD_interconnect ...
    1 replies | 174 view(s)
  • kenwickvs's Avatar
    May 26th, 2018, 08:05 PM
    kenwickvs replied to a thread Paint Codes for DEC Cabinets in DEC
    Thanks DDS for your reply. I enjoyed the links! I'm thinking: "Paint (Lacquer), Touch-up, Aerosol,Terra Cotta 49-01524-06" might be the one as it's...
    7 replies | 459 view(s)
  • kenwickvs's Avatar
    May 26th, 2018, 11:19 AM
    Hello, y'all, Does anyone have an idea of what the color codes are that DEC used for the PDP? I have an old 11/23 front panel and would like to...
    7 replies | 459 view(s)
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About kenwickvs

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About kenwickvs
Biography:
Incessant digital hardware designer since 1974. There's no known cure. I have dabbled in low level software as a necessity to support my hardware addiction.
Location:
Raleigh, North Carolina, USA
Interests:
Digital Design, Real-time systems, Complex mechanical systems. How things work.
Occupation:
Retired engineering and manufacuturing company owner.

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