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  • bqt's Avatar
    Today, 03:34 PM
    bqt replied to a thread headless microVAX? in DEC
    The fact that a MicroVAX supposedly never have a "head", and thus always, and implicitly are headless don't mean they are any less headless. The...
    11 replies | 178 view(s)
  • bqt's Avatar
    Today, 03:14 AM
    bqt replied to a thread headless microVAX? in DEC
    That's what "headless" means. I assumed you understood that since you had it in the topic. Headless -> no monitor and keyboard. Instead you have...
    11 replies | 178 view(s)
  • bqt's Avatar
    November 30th, 2020, 10:36 AM
    bqt replied to a thread PDP-8 wanted in DEC
    I have both an 8/m and an 8/f, and they are pretty much identical, except for the "8/m" vs. "8/f" lettering on the front (obviously). Yes, the 8/m...
    24 replies | 904 view(s)
  • bqt's Avatar
    November 29th, 2020, 04:19 AM
    bqt replied to a thread You can netboot Ultrix from Linux in DEC
    You can netboot RSX-11S. It was designed for exactly that purpose.
    4 replies | 160 view(s)
  • bqt's Avatar
    November 28th, 2020, 06:21 PM
    bqt replied to a thread PDP-8 wanted in DEC
    No. I just took that info from Wikipedia. I should know better than just blindly trust that thing. Thanks for correcting me.
    24 replies | 904 view(s)
  • bqt's Avatar
    November 28th, 2020, 10:22 AM
    bqt replied to a thread PDP-8 wanted in DEC
    Oh, right. Now that you mention it, this rings some sort of a bell. I have heard about that expansion, but don't really know anything more about it...
    24 replies | 904 view(s)
  • bqt's Avatar
    November 28th, 2020, 10:20 AM
    bqt replied to a thread PDP-8 wanted in DEC
    Ah. My fault. I assumed you talked about the 6120, and not the SBC. By the way, the DECmate I have a 6100, not a 6120.
    24 replies | 904 view(s)
  • bqt's Avatar
    November 28th, 2020, 10:19 AM
    bqt replied to a thread PDP-8 wanted in DEC
    Ok. Fair enough. If you then tell me that you always say that the 8/I is limited to 8K, then you are consistent, and it makes sense in a way. Yes,...
    24 replies | 904 view(s)
  • bqt's Avatar
    November 28th, 2020, 07:10 AM
    bqt replied to a thread MicroSD disk controller for PDP-11 in DEC
    What is the state of these things? Is it still no DMA, and an ethernet controller which is not compatible with any DEC model? (For me, those are...
    27 replies | 3861 view(s)
  • bqt's Avatar
    November 28th, 2020, 06:57 AM
    bqt replied to a thread PDP-8 wanted in DEC
    No, there were plenty more machines made with 6120 than "normal" PDP-8 systems. The DECmate II and onwards was fairly successful, and was sold from...
    24 replies | 904 view(s)
  • bqt's Avatar
    November 28th, 2020, 06:49 AM
    bqt replied to a thread PDP-8 wanted in DEC
    That's incorrect. The 8/L have a memory expansion option for 8K. It implements the same CIF and CDF instructions as all other PDP-8 models, but...
    24 replies | 904 view(s)
  • bqt's Avatar
    November 25th, 2020, 12:35 PM
    bqt replied to a thread PDP-11/24 in BA11-A with H7140 PSU in DEC
    You definitely have something wrong in your serial settings. Either speed, parity, stopbits or combinations of all of them. If you look, the...
    9 replies | 368 view(s)
  • bqt's Avatar
    November 23rd, 2020, 03:57 PM
    bqt replied to a thread RK05 disk drive versions in DEC
    That I could. But you'll have to remind me in July, when I might be getting close. I have a lousy memory.
    10 replies | 387 view(s)
  • bqt's Avatar
    November 23rd, 2020, 11:10 AM
    bqt replied to a thread RK05 disk drive versions in DEC
    No plans to sell it. In addition, I have it somewhere in Sweden, while I live in Switzerland. And with the current travel restrictions, I doubt I'll...
    10 replies | 387 view(s)
  • bqt's Avatar
    November 23rd, 2020, 08:47 AM
    bqt replied to a thread PDP-11/24 in BA11-A with H7140 PSU in DEC
    CPU, Unibus map and memory... I'm not sure any of them put any load on +12V at all, so I would wonder if the +12V is completely unloaded here. DEC...
    9 replies | 368 view(s)
  • bqt's Avatar
    November 23rd, 2020, 08:45 AM
    bqt replied to a thread RK05 disk drive versions in DEC
    Interestingly, the RK05j "sticker" I have on one of my drives is the one on which a unit select switch was added to the front. On these pictures, one...
    10 replies | 387 view(s)
  • bqt's Avatar
    November 22nd, 2020, 11:16 AM
    bqt replied to a thread Reading old tape backup in DEC
    All correct, with the small caveat that with regards to PDP-11 systems, it is 6250 which is very unusual. The only supported tape drive that could do...
    11 replies | 382 view(s)
  • bqt's Avatar
    November 21st, 2020, 02:27 AM
    bqt replied to a thread Reading old tape backup in DEC
    Sure. At Update we have an 11/70 running RSX, which have a TU81. That means we can read 1600 bpi and 6250 bpi tapes easily. However, that is in...
    11 replies | 382 view(s)
  • bqt's Avatar
    November 15th, 2020, 01:46 PM
    bqt replied to a thread PDP-11/24 in BA11-A with H7140 PSU in DEC
    I am totally confused. Was it correct, or wrong? Also, be aware that the nomenclature here in DEC documentation can be confusing. Sometimes you...
    9 replies | 368 view(s)
  • bqt's Avatar
    November 8th, 2020, 04:35 AM
    It's the RK05 that have hard sectors, and differs for a PDP-8 or PDP-11. The RL packs are the same for the -8 and -11. But yeah, it would be quite a...
    3 replies | 371 view(s)
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About bqt

Basic Information

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

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September 15th, 2019
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