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  • bqt's Avatar
    Yesterday, 11:29 PM
    bqt replied to a thread What did I do to my PDP-8 today. in DEC
    Correct, in as far as what the FORTRAN runtime system does. When calling OS/8 drivers, interrupts needs to be off, since the drivers are written with...
    159 replies | 10242 view(s)
  • bqt's Avatar
    January 22nd, 2021, 08:16 PM
    bqt replied to a thread PDP-8/M restoration - Jerry Walker in DEC
    Uh... Say what? I didn't look at the videos, but that would indeed be very bad. But it also sortof don't work so well. The flip chip connectors don't...
    12 replies | 275 view(s)
  • bqt's Avatar
    January 22nd, 2021, 04:08 PM
    bqt replied to a thread PDP-8/M restoration - Jerry Walker in DEC
    The order of the cards actually don't matter at all. DEC documentation have an order given, but putting them in backwards, or placing them elsewhere...
    12 replies | 275 view(s)
  • bqt's Avatar
    January 20th, 2021, 03:04 PM
    At least something: http://www.bitsavers.org/pdf/dec/pdp11/1104/MP00019_1104_EngrDrws_Feb78.pdf
    19 replies | 850 view(s)
  • bqt's Avatar
    January 20th, 2021, 09:12 AM
    bqt replied to a thread C compiler for openVMS alpha in DEC
    Can't really help with the actual problem, but I should point out that hecnet isn't an entity in that way. the hecnet.eu domain was run by an...
    3 replies | 101 view(s)
  • bqt's Avatar
    January 20th, 2021, 09:07 AM
    bqt replied to a thread What did I do to my PDP-8 today. in DEC
    BASIC.UF is an optional file that contains any user written/defined functions that you want to be able to access from your BASIC program. It don't...
    159 replies | 10242 view(s)
  • bqt's Avatar
    January 11th, 2021, 05:13 PM
    I believe the board are all different. I would also expect them to have different firmware. But they are similar to one another...
    2 replies | 134 view(s)
  • bqt's Avatar
    January 11th, 2021, 10:11 AM
    bqt replied to a thread RX01 floppy drive adventures in DEC
    Cover? I didn't pay enough attention. There is a cover. Never seen one either. However, it also looks like a desktop unit. No mounting rails or...
    11 replies | 519 view(s)
  • bqt's Avatar
    January 11th, 2021, 10:05 AM
    Yes, pretty much all compilers nowadays supports the concept of a "packed" attribute. But since there is no way to express this in the standard,...
    44 replies | 2491 view(s)
  • bqt's Avatar
    January 10th, 2021, 07:11 AM
    bqt replied to a thread RX01 floppy drive adventures in DEC
    It's actually not uncommon for the screws for the top PCB to be missing. As people needed to access the things inside, you need to remove those...
    11 replies | 519 view(s)
  • bqt's Avatar
    January 10th, 2021, 07:03 AM
    I can't remember where I read it, but I seem to remember seeing somewhere that an RCT with at least one block is required/expected. But you are...
    44 replies | 2491 view(s)
  • bqt's Avatar
    January 9th, 2021, 12:51 PM
    bqt replied to a thread PDP-8 core memory troubleshooting in DEC
    Ah. It was Anders repair that I was thinking of then. Thanks for clarifying. And yes, this is definitely harder. But I wanted to at least make...
    69 replies | 3329 view(s)
  • bqt's Avatar
    January 9th, 2021, 05:30 AM
    Ah. Ok, got it. I thought you had redone this as structure anyway, which would just make everything so much more sane. Anyway, on a PDP-11 or a...
    44 replies | 2491 view(s)
  • bqt's Avatar
    January 9th, 2021, 04:08 AM
    bqt replied to a thread PDP-8 core memory troubleshooting in DEC
    Not an article, but a recollection of a post, I think. I wonder if it might have been Mattis Lind (who I think is also looking at this thread) who...
    69 replies | 3329 view(s)
  • bqt's Avatar
    January 8th, 2021, 11:48 PM
    bqt replied to a thread PDP-8 core memory troubleshooting in DEC
    Just as a different comment. I do know that I've read about people repairing the actual core mat as well. So it's possible, even if not the must fun...
    69 replies | 3329 view(s)
  • bqt's Avatar
    January 7th, 2021, 10:41 AM
    Skipping the delays makes total sense here, for the reasons you mention. I'm not sure I follow what you mean by prefixes as indexes into an array...
    44 replies | 2491 view(s)
  • bqt's Avatar
    January 4th, 2021, 11:52 AM
    Just FYI: Some of these schematics and manuals might already be scanned, and on bitsavers. Always worth checking there if you are searching for any...
    19 replies | 850 view(s)
  • bqt's Avatar
    January 3rd, 2021, 04:10 AM
    I can't help your brain understand C. :-) But I can help by answering questions. For me, it's fairly straight forward... But I don't have much issue...
    44 replies | 2491 view(s)
  • bqt's Avatar
    January 2nd, 2021, 08:47 AM
    That's a very simple C question. :-) Adding an integer to a pointer is the same as indexing, but you get the pointer as a result. Example: ...
    44 replies | 2491 view(s)
  • bqt's Avatar
    January 1st, 2021, 12:53 PM
    I would agree that a union of the different messages would make it much more nicely structured and accessible. simh might not be the best reference...
    44 replies | 2491 view(s)
  • bqt's Avatar
    January 1st, 2021, 12:51 PM
    The manuals for the RA70 are probably somewhere if you really search around. But as far as I can recall, to change the unit number using the...
    11 replies | 549 view(s)
  • bqt's Avatar
    January 1st, 2021, 05:41 AM
    bqt replied to a thread What did I do to my PDP-8 today. in DEC
    Assuming you know what DNS is (essentially how computers get from host names to IP addresses), mDNS is a way of doing this for a local network...
    159 replies | 10242 view(s)
  • bqt's Avatar
    January 1st, 2021, 05:34 AM
    You can't. SDI is not even close to DSSI in this aspect. With SDI, you need to use a front panel to reprogram what unit number it has. Or, if this...
    11 replies | 549 view(s)
  • bqt's Avatar
    December 31st, 2020, 08:06 AM
    bqt replied to a thread What did I do to my PDP-8 today. in DEC
    Mine have mdns enabled. I would suspect maybe yours have as well? In which case you should be able to find it as "raspberrypi.local". So no need to...
    159 replies | 10242 view(s)
  • bqt's Avatar
    December 30th, 2020, 10:52 PM
    bqt replied to a thread DEC-20 Day! in DEC
    Yeah, that's the story I've heard too. However, speaking to DEC people who worked on the 11/74, they claim that all were returned after the field...
    40 replies | 2682 view(s)
  • bqt's Avatar
    December 30th, 2020, 10:19 AM
    bqt replied to a thread KD-11D reviwal in DEC
    If booting via serial, with a fake disk over serial, then the system is not doing any DMA at all. Which would suggest that there might indeed be a...
    16 replies | 672 view(s)
  • bqt's Avatar
    December 30th, 2020, 02:54 AM
    They do it after initializing/OS booting as well, if they are just sitting idle... Not always that common on a running system, though. :-)
    11 replies | 549 view(s)
  • bqt's Avatar
    December 30th, 2020, 02:52 AM
    bqt replied to a thread DEC-20 Day! in DEC
    The 11/74 at Hydro is a story I've seen many times, and I've tried to chase it down. So far, it seems that one is a rumor. But yeah, lots of the last...
    40 replies | 2682 view(s)
  • bqt's Avatar
    December 29th, 2020, 06:02 PM
    As for power, I guess wiring an adapter from a 5-pin connector shouldn't be too hard. I know that RA70 drives were commonly used without any OCP...
    11 replies | 549 view(s)
  • bqt's Avatar
    December 29th, 2020, 06:52 AM
    bqt replied to a thread DEC-20 Day! in DEC
    Interesting. I'm not sure how spread the style of connectors we use in Europe is, but they are definitely cheaper. I checked around, and 400V 3phase,...
    40 replies | 2682 view(s)
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About bqt

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About bqt
Location:
Zurich, CH
Interests:
Old computers
Occupation:
Computers

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