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  • MattisLind's Avatar
    Today, 09:07 AM
    A M9301 is easy to check out. Just examine memory at 173000-173776 and 165000-165776. There is a small instruction test that test some basic tests in...
    8 replies | 169 view(s)
  • MattisLind's Avatar
    Today, 04:44 AM
    You don’t have a M9301 or M9312 board, right? If you have such a board PDP11GUI is a good idea. These bootstraps contain a basic CPU test. With...
    8 replies | 169 view(s)
  • m_thompson's Avatar
    July 4th, 2020, 03:24 PM
    Make a load board for the other voltages that plugs into a backplane slot?
    15 replies | 573 view(s)
  • MattisLind's Avatar
    July 4th, 2020, 01:04 PM
    https://www.liveauctioneers.com/item/86804145_sweda-750-computers-and-vintage-electronics Quite a bunch of Diablo drives. The Entrex system look...
    5 replies | 122 view(s)
  • m_thompson's Avatar
    July 4th, 2020, 07:11 AM
    I think that about a 20% load on the voltages would be enough to debug the power supply.
    15 replies | 573 view(s)
  • m_thompson's Avatar
    July 3rd, 2020, 04:00 PM
    I would 2) build the dummy load and observe the system under the test conditions some more >One capacitor on the memory regulator board read a...
    15 replies | 573 view(s)
  • MattisLind's Avatar
    June 28th, 2020, 06:46 AM
    Saw this 24k 4051 memory board on EBay....
    14 replies | 973 view(s)
  • m_thompson's Avatar
    June 19th, 2020, 01:01 PM
    m_thompson started a thread VAX 11/750 for the RICM in DEC
    We picked up a recently donated VAX 11/750 Saturday. The cabinet that contained the RA60 was a mess from mice living in it so we removed the RA60,...
    0 replies | 168 view(s)
  • MattisLind's Avatar
    June 13th, 2020, 07:03 AM
    MattisLind replied to a thread TU58 dump tool? in DEC
    I put DDDRV.MAC on my drive so that anyone else can have a look. But I couldn't find LB:ETU58.CNF in my installation of RSX11-M 4.6.
    42 replies | 1869 view(s)
  • MattisLind's Avatar
    June 13th, 2020, 06:52 AM
    MattisLind replied to a thread TU58 dump tool? in DEC
    The retries is really strange since I know that when reading tapes under RT-11 I have seen retries. It is a quite distinct sound when the drive do a...
    42 replies | 1869 view(s)
  • MattisLind's Avatar
    June 13th, 2020, 05:49 AM
    MattisLind replied to a thread TU58 dump tool? in DEC
    Hmm. That is incredibly weird since it happens for one block reads. Maybe one need to use Ersatz-11 and configure the serial port as a real...
    42 replies | 1869 view(s)
  • MattisLind's Avatar
    June 13th, 2020, 02:24 AM
    MattisLind replied to a thread TU58 dump tool? in DEC
    I did a quick check of the DD.MAC file. But to me it looks like it all errors are fatal? A bit harder than I thought to get the grip of how it...
    42 replies | 1869 view(s)
  • MattisLind's Avatar
    June 13th, 2020, 12:34 AM
    MattisLind replied to a thread TU58 dump tool? in DEC
    Yes. I did check the manual and as you say, nothing mentioned about -126. That would correspond to 202 octal or 10000010 binary. Maybe a disassembly...
    42 replies | 1869 view(s)
  • MattisLind's Avatar
    June 12th, 2020, 08:15 AM
    MattisLind replied to a thread TU58 dump tool? in DEC
    Ok. I have tried now with real hardware and it appears to work. I took your code and quickly added my wrapper. Removed all RX02 stuff and voila, the...
    42 replies | 1869 view(s)
  • MattisLind's Avatar
    June 11th, 2020, 05:14 AM
    MattisLind replied to a thread TU58 dump tool? in DEC
    Here are a few TU58 which I think has Files-11 FS: https://drive.google.com/file/d/1u0JAw3MFg63VejRdd4mPU5z3-u93ISXl/view?usp=drivesdk ...
    42 replies | 1869 view(s)
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