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  • vrs42's Avatar
    Today, 12:56 AM
    vrs42 replied to a thread What did I do to my PDP-8 today. in DEC
    Comitted this tonight, after running it through the palbart tests. I got mostly better answers than palbart, though apparently palbart handles...
    125 replies | 9150 view(s)
  • vrs42's Avatar
    January 17th, 2021, 11:34 PM
    vrs42 replied to a thread What did I do to my PDP-8 today. in DEC
    Well, it was new to me, too. No idea why some conditionals are multiplied by 2, and others are multiplied by 4 (then incremented, IIRC?). Probably...
    125 replies | 9150 view(s)
  • vrs42's Avatar
    January 17th, 2021, 06:31 PM
    vrs42 replied to a thread What did I do to my PDP-8 today. in DEC
    I finally fixed the operation of *.-1 177+1 in my cross assembler. I had to completely redo expression handling so that it processes left to...
    125 replies | 9150 view(s)
  • ftcnet's Avatar
    January 10th, 2021, 10:30 PM
    Buss is known for making fuses, but it's an odd looking fuse. If it measures shorted (or open) it's probably a fuse.
    3 replies | 142 view(s)
  • ftcnet's Avatar
    January 3rd, 2021, 11:23 PM
    Now that you have the failed (or suspected faulty) IC removed from the PCB what is the recommended 'best practice'? Do you just solder in a...
    16 replies | 831 view(s)
  • vrs42's Avatar
    January 3rd, 2021, 08:48 PM
    You should find that the BIN format image file name works as a target of the SIMH "load" command. From there, it's not hard to get it running. ...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    January 3rd, 2021, 10:53 AM
    It may be wise, if possible, to confirm that you're loading the same file I've got. Perhaps you could run mmap from...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    January 3rd, 2021, 04:52 AM
    I'd probably have used d0cc, as it's a little newer. Don't think that's your problem, though. A quick check of the memory map on page 61/66...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    January 1st, 2021, 06:10 PM
    I also forgot to mention comments; a BIN tape is allowed to wrap arbitrary rubbish between <DEL> codes, which should be ignored by the loader. This...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    January 1st, 2021, 02:34 PM
    Oh, and I've completely left out discussion of the DTORG botch, which I hope I never actually find used in a tape image! (DTORG corrupts a BIN...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    January 1st, 2021, 02:28 PM
    OK, I'll try to keep it short, so as not to bore everyone with a review of RIM and BIN formats... BIN and RIM formats are quite similar. Both...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    January 1st, 2021, 12:59 PM
    Ah, upon investigating, I discovered that the tape images were in the "magic" format that is valid as either a RIM or a BIN tape. I corrected a...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    January 1st, 2021, 09:49 AM
    Assuming RIM format is OK, you can find that as ak-0617a or dec-08-lbaa-pm in the "big list", which is now also the DEC software page on...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    December 28th, 2020, 06:14 PM
    I have a bag here of what claims to be 50 DEC1540G parts, with what appear to be TI logos and 1976 date stamps. I might be persuaded to ship a...
    69 replies | 3124 view(s)
  • vrs42's Avatar
    December 28th, 2020, 02:32 PM
    vrs42 replied to a thread What did I do to my PDP-8 today. in DEC
    Haven't had much to contribute to the DMS effort, I'm afraid. My "big list" project is getting there, though: ...
    125 replies | 9150 view(s)
  • vrs42's Avatar
    December 24th, 2020, 06:11 PM
    vrs42 replied to a thread What did I do to my PDP-8 today. in DEC
    Have you looked at https://www.pdp8.net/pdp8cgi/dms_html?act=dir;fn=linctape-images/dmsl/disk_monitor_source.linc;sort=name yet? Dave's got what...
    125 replies | 9150 view(s)
  • vrs42's Avatar
    December 24th, 2020, 03:48 PM
    vrs42 replied to a thread What did I do to my PDP-8 today. in DEC
    Well, I thought so :-)! I haven't seen a DMS project in...ever? Is the LD12 a 4K only machine? I was fairly pleased to check and find most...
    125 replies | 9150 view(s)
  • vrs42's Avatar
    December 24th, 2020, 10:11 AM
    vrs42 replied to a thread What did I do to my PDP-8 today. in DEC
    Is no-one working on cool PDP-8 stuff lately?! I continue to work on my "big list" of the DEC PDP-8 software. It continues to get more complete,...
    125 replies | 9150 view(s)
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About vrs42

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About vrs42
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Beaverton, Oregon
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The PDP-8

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