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  • bqt's Avatar
    January 22nd, 2020, 01:41 AM
    bqt replied to a thread No serial output on PDP-11 in DEC
    Sure. A logic analyzer is basically just a kind of oscilloscope. Definitely good enough to be usable to check for clocks. Exactly how you do it is...
    26 replies | 659 view(s)
  • bqt's Avatar
    January 22nd, 2020, 01:39 AM
    I don't have any details of the filter. Maybe there is some documentation somewhere on bitsavers? The rackmount version have (if I remember mine...
    55 replies | 3660 view(s)
  • bqt's Avatar
    January 20th, 2020, 01:36 AM
    On the 8/E? Yes. The power supply is located there, along with fans. A filter is a good idea.
    55 replies | 3660 view(s)
  • bqt's Avatar
    January 19th, 2020, 03:25 AM
    bqt replied to a thread No serial output on PDP-11 in DEC
    The wires are from your probes? Did you ever have this thing working, or is this the initial attempt? I would suspect modem signals is not the...
    26 replies | 659 view(s)
  • bqt's Avatar
    January 19th, 2020, 03:11 AM
    bqt replied to a thread No serial output on PDP-11 in DEC
    Right. Good point. But I would assume it is, or a lot of things would become "interesting". The Z80 peripherals are not connected directly to the...
    26 replies | 659 view(s)
  • bqt's Avatar
    January 18th, 2020, 02:51 AM
    bqt replied to a thread No serial output on PDP-11 in DEC
    Well, I can't see the SIO there, but I don't think that would help much. Anyway, with Z80 systems, you commonly used a SIO in combination with the...
    26 replies | 659 view(s)
  • bqt's Avatar
    January 15th, 2020, 12:45 AM
    bqt replied to a thread TU58 XXDP on PDP-11/05 with 8KW? in DEC
    Some rumor had it that you wrote a magic sequence into the CSR for the TMSCP, yes. A vague memory of mine is that it was the word for "MU". But that...
    24 replies | 922 view(s)
  • bqt's Avatar
    January 13th, 2020, 12:21 AM
    bqt replied to a thread RT-11 and multiple MSCP Controller in DEC
    RSX is sortof in between. In the normal system, you only have DUn: device names. At SYSGEN, you specify for each device name, what controller and...
    4 replies | 220 view(s)
  • bqt's Avatar
    January 8th, 2020, 03:48 AM
    bqt replied to a thread TU58 XXDP on PDP-11/05 with 8KW? in DEC
    There might be a case for still implementing the M9312. There are software that traps system crashes and does a reboot by jumping to the known...
    24 replies | 922 view(s)
  • bqt's Avatar
    January 5th, 2020, 11:49 PM
    Yes. Serial loopback. You need them when running some diagnostics and self-tests. And there are a standard for SCSI on a DB25 as well.
    2 replies | 196 view(s)
  • bqt's Avatar
    January 4th, 2020, 11:23 AM
    bqt replied to a thread TU58 XXDP on PDP-11/05 with 8KW? in DEC
    Urgh. This might become very complicated. Yes, if you have the "latest" version of XXDP, there are actually two versions, and one is meant for small...
    24 replies | 922 view(s)
  • bqt's Avatar
    December 29th, 2019, 03:31 AM
    bqt replied to a thread VAX 7000-640 CPU frequency in DEC
    So then I guess you'll change the stated limit. But to what?
    68 replies | 9310 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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