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  • bqt's Avatar
    December 11th, 2019, 04:23 PM
    bqt replied to a thread QBUS Card Reader Controllers in DEC
    DEC never did a card reader controller for the Qbus. And the one for the Unibus was not very common as far as I can tell. DEC was never much into...
    1 replies | 127 view(s)
  • bqt's Avatar
    December 10th, 2019, 04:25 PM
    bqt replied to a thread VAX 7000-640 CPU frequency in DEC
    Another way of responding to this: Your code, running under V7 on an 11/70 claims the maximum number of digits are 7344. The table space needed...
    61 replies | 7853 view(s)
  • bqt's Avatar
    December 10th, 2019, 04:05 PM
    bqt replied to a thread Parallel printer cable for PDP-11 in DEC
    No, the DRV11 wouldn't be software compatible, as far as I know. But that would not prevent anyone from using it to communicate with a printer, with...
    5 replies | 250 view(s)
  • bqt's Avatar
    December 10th, 2019, 04:02 PM
    bqt replied to a thread VAX 7000-640 CPU frequency in DEC
    Yes it does. You select an algorithm that uses more space for code, at the cost of fewer digits. Why did you choose that algorithm? It's clearly not...
    61 replies | 7853 view(s)
  • bqt's Avatar
    December 8th, 2019, 11:40 AM
    bqt replied to a thread VAX 7000-640 CPU frequency in DEC
    Well, then none of your current implementations are acceptable for the PDP-11. You can get more digits by using a slower implementation.
    61 replies | 7853 view(s)
  • bqt's Avatar
    December 3rd, 2019, 05:06 PM
    bqt replied to a thread New to me Rainbow 100A and VR201 in DEC
    The reason Kermit was created to start with was to allow transfer of files between different type of machines. As such, of course it is a protocol....
    76 replies | 4624 view(s)
  • bqt's Avatar
    December 3rd, 2019, 05:00 PM
    As far as I know, the problem with the J11 wasn't volume, but that early production did not hit the speed target they were aiming for. Now sure they...
    8 replies | 382 view(s)
  • bqt's Avatar
    December 2nd, 2019, 01:38 PM
    The problem is that sources like Wikipedia claims 600.000 PDP-11s were sold in total. Now, I can believe that plain T11 CPUs are outside of that...
    8 replies | 382 view(s)
  • bqt's Avatar
    December 2nd, 2019, 11:12 AM
    Yes. I think that would probably be the main contestant for most produced PDP-11 CPU. However, I wonder if they really sold 300.000 of them... So if...
    8 replies | 382 view(s)
  • bqt's Avatar
    December 2nd, 2019, 09:27 AM
    bqt replied to a thread VAX 7000-640 CPU frequency in DEC
    Well, you'll have to decide what you want to optimize for. I can easily write you a program that does 9360 digits on a PDP-11. But then it will be...
    61 replies | 7853 view(s)
  • bqt's Avatar
    December 2nd, 2019, 01:46 AM
    bqt replied to a thread VAX 7000-640 CPU frequency in DEC
    Well, it does 4 digits per iteration. It just have a lower maximum number of digits. Still above 3000 by a large margin. Same algorithm, just a lower...
    61 replies | 7853 view(s)
  • bqt's Avatar
    November 27th, 2019, 12:43 AM
    bqt replied to a thread New to me Rainbow 100A and VR201 in DEC
    Ah. Well then, even if you did have FILEX, it wouldn't help you. /DOS under RT-11 does not mean MS-DOS like file system, but DOS-11, which was a...
    76 replies | 4624 view(s)
  • bqt's Avatar
    November 26th, 2019, 04:05 PM
    bqt replied to a thread New to me Rainbow 100A and VR201 in DEC
    Using a Pro with P/OS, I would recommend you try to locate TPC, which (if I remember right) can also dump diskettes to file. TPC is a DECUS program...
    76 replies | 4624 view(s)
  • bqt's Avatar
    November 26th, 2019, 04:01 PM
    bqt replied to a thread 11/70 mounting panel/support in DEC
    Feel free to disagree. I can only report that on a real 11/70, the front panel is mounted on the CPU box. The CPU box is then mounted on rails in the...
    15 replies | 728 view(s)
  • bqt's Avatar
    November 25th, 2019, 04:21 PM
    bqt replied to a thread 11/70 mounting panel/support in DEC
    I think you missed my point. The front panel *mounts* to the CPU box, and nothing else. Any number of BA11 will not help you. The circuit board is...
    15 replies | 728 view(s)
  • bqt's Avatar
    November 25th, 2019, 02:19 AM
    bqt replied to a thread 11/70 mounting panel/support in DEC
    Your problem is that the front panel do not mount to the rack. The front panel mounts to the CPU box. And the CPU box is a rather large piece of...
    15 replies | 728 view(s)
  • bqt's Avatar
    November 24th, 2019, 02:22 PM
    bqt replied to a thread WiFi Modem for VT-100/102? in DEC
    Just open it. There are several potentiometers you can adjust, and they are marked on the board what they are for. And one is for that exact thing.
    22 replies | 1131 view(s)
  • bqt's Avatar
    November 18th, 2019, 01:28 AM
    So that would mean that the NPG is wired directly from the Unibus in to the Unibus out slot then? I've never seen a backplane like that. And I...
    16 replies | 835 view(s)
  • bqt's Avatar
    November 17th, 2019, 03:43 AM
    There are two different kind of SPC slots. Normal Unibus Device, and Modified Unibus Device (also called MUD). Look at any PDP-11 documentation, and...
    16 replies | 835 view(s)
  • bqt's Avatar
    November 17th, 2019, 03:39 AM
    bqt replied to a thread WiFi Modem for VT-100/102? in DEC
    Nice gadgets. But yes, they are computers. They even come with a built-in web server, if you read the fine print. :-) And while there are certainly...
    22 replies | 1131 view(s)
  • bqt's Avatar
    November 16th, 2019, 05:50 AM
    bqt replied to a thread WiFi Modem for VT-100/102? in DEC
    A "WIFI/SSH/TELNET" adapter is called a computer. The VT102 do not have any ability to do any processing. It simply sends bytes over a serial port,...
    22 replies | 1131 view(s)
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About bqt

Basic Information

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

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