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  • bqt's Avatar
    Today, 01:54 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    No. You let the OS steal the space for you. And I pointed out that I can let the system do the work for me by using a new device driver, or with TCP,...
    42 replies | 4262 view(s)
  • bqt's Avatar
    Yesterday, 06:59 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    And it is still the case that it is the exact same CPU, so any difference in numbers are essentially proving that the number is representing...
    42 replies | 4262 view(s)
  • bqt's Avatar
    Yesterday, 03:24 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    1s at 3000 digits. So, which way is it? Insignificant, or is there a difference between the OSes? We are talking about the identical code running in...
    42 replies | 4262 view(s)
  • bqt's Avatar
    Yesterday, 02:53 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    I won't even bother commenting on most parts of what you write. I will say that you can't both claim that differences between different OSes are...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 26th, 2020, 11:06 AM
    Yes, this was fixed in patch 453, dated Oct 11. 2019. So it was more recent than I had through. I received a copy somewhat earlier, but it took time...
    8 replies | 254 view(s)
  • bqt's Avatar
    March 26th, 2020, 08:23 AM
    The part about FP support on the QED-993 existing, but being optional was something I read from Quickware. I would assume they know, but I have never...
    8 replies | 254 view(s)
  • bqt's Avatar
    March 26th, 2020, 01:40 AM
    2.11BSD works fine on hardware without FP. It was fixed a few months ago, or maybe a year... But I would still probably recommend a processor with...
    8 replies | 254 view(s)
  • bqt's Avatar
    March 22nd, 2020, 10:49 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    Here are my final runs of this exercise. This is all run on the same PDP-11/93. Each number is the best achieved after three runs. Except for once...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 22nd, 2020, 09:49 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    For some instance of 11/70, running some OS, with some kind of connection. For other variants, the difference might be much larger, even if we still...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 22nd, 2020, 05:23 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    If you read the full article you linked to, you have a whole bunch of those tests... Didn't you even read that thing yourself before posting the...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 21st, 2020, 09:08 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    Nope. Digits are printed during calculation, and that printing is included in the final "number". I've already had long discussions about this, but...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 15th, 2020, 02:41 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    If you were to just take the CPU frequency numbers and compare them from this article, you would indeed get a very meaningless piece of information....
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 14th, 2020, 04:29 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    No doubt people have tried to make such comparisons for ages. And every time other people have pointed out that it is meaningless. And gives you...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 10th, 2020, 03:47 PM
    bqt replied to a thread PDP-9 at the RICM in DEC
    Doh! Sorry. My brain wasn't working right. Of course it is 256 words in a block, and not 128. Interestingly enough, both code I looked at, as well as...
    128 replies | 21974 view(s)
  • bqt's Avatar
    March 9th, 2020, 05:17 PM
    bqt replied to a thread PDP-9/PDP-15 ADSS DECtape on eBay in DEC
    The other side of the green cannister says PDP-15, so maybe this is an RSX-15 directory listing?
    11 replies | 621 view(s)
  • bqt's Avatar
    March 9th, 2020, 05:11 PM
    bqt replied to a thread PDP-9 at the RICM in DEC
    That, unfortunately, don't mean anything to me. Is it some hardware or software? For which platform? I do know how the format on the tape looks...
    128 replies | 21974 view(s)
  • bqt's Avatar
    March 8th, 2020, 05:29 PM
    bqt replied to a thread PDP-9 at the RICM in DEC
    You do know that the only difference between the "PDP-8" format and the <all other systems> format is the size of a block, right? If you run off...
    128 replies | 21974 view(s)
  • bqt's Avatar
    March 8th, 2020, 04:21 AM
    bqt replied to a thread MIDI on PDP8 in DEC
    Hum. Why the RS-232 to TTL converter? Don't you know that the M8650 already have TTL outputs as well? It's pretty cool actually. The M8650 can drive...
    9 replies | 442 view(s)
  • bqt's Avatar
    March 8th, 2020, 04:17 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    But that is incorrect. It's the same logic components if we talk about logic gates. But we are not. We are talking microcode, which have wildly...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 7th, 2020, 02:07 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    Agreed. And the 33.333 MHz clock of the 11/70 is not meaningful to talk about at all. It makes half sense to talk about the 6.67 MHz clock you get...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 7th, 2020, 02:03 AM
    bqt replied to a thread Is This The End For VMS Hobbyists? in DEC
    Since VMS have been taken over by VSI, I would assume it is VSI that people will have to try and reach out to.
    21 replies | 1403 view(s)
  • bqt's Avatar
    March 6th, 2020, 04:04 PM
    bqt replied to a thread PDP-11 π benchmark in DEC
    I would argue that 6.67 MHz is the best number to use if you want to put a frequency on the KB11C CPU. Just because the minimum number of microcode...
    42 replies | 4262 view(s)
  • bqt's Avatar
    March 1st, 2020, 05:44 AM
    bqt replied to a thread PDP-11 π benchmark in DEC
    Very late comment, but the fastest hardware PDP-11 is, I believe, the Quickware QED-993. As far as I can remember, they are about 4x the speed of an...
    42 replies | 4262 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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