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  • m_thompson's Avatar
    July 4th, 2020, 03:24 PM
    Make a load board for the other voltages that plugs into a backplane slot?
    14 replies | 440 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 | 113 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.
    14 replies | 440 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...
    14 replies | 440 view(s)
  • MattisLind's Avatar
    June 28th, 2020, 06:46 AM
    Saw this 24k 4051 memory board on EBay....
    14 replies | 952 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 | 164 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 | 1833 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 | 1833 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 | 1833 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 | 1833 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 | 1833 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 | 1833 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 | 1833 view(s)
  • MattisLind's Avatar
    June 10th, 2020, 11:01 PM
    MattisLind replied to a thread TU58 dump tool? in DEC
    Looked quickly at your tu58_driver.c code. It indeed look very promising. I have a wrapper for running Arduino code on a Linux host for testing...
    42 replies | 1833 view(s)
  • MattisLind's Avatar
    June 10th, 2020, 10:10 PM
    MattisLind replied to a thread TU58 dump tool? in DEC
    I have approximately 80 TU58 tapes left to dump. Mostly 11/730 and 11/750 diagnostic and console tapes. Not sure if there are dumps of them already....
    42 replies | 1833 view(s)
  • MattisLind's Avatar
    June 10th, 2020, 09:53 PM
    MattisLind replied to a thread TU58 dump tool? in DEC
    Retrieving all the blocks of a physical TU58 cartridge and store them into a file on the host computer so that I can use them in SimH and or tu58em.
    42 replies | 1833 view(s)
  • MattisLind's Avatar
    June 10th, 2020, 11:00 AM
    MattisLind started a thread TU58 dump tool? in DEC
    Is there anyone that has built a tool already do dump TU58-tapes on a Linux machine? There is PUTR of course. But it is DOS only and is written in...
    42 replies | 1833 view(s)
  • MattisLind's Avatar
    June 8th, 2020, 08:32 AM
    Not mine. https://www.ebay.com/itm/203014799203
    3 replies | 221 view(s)
  • MattisLind's Avatar
    June 8th, 2020, 03:33 AM
    I have recovered approx forty TU58 formatted DC100 tapes. Didn't bake them. No shedding. But prior to removing the existing band I heated it with a...
    26 replies | 3343 view(s)
  • MattisLind's Avatar
    June 8th, 2020, 03:20 AM
    On the plastibands package it says manufactured in Japan. As far as I can see the sizes are not matching:...
    26 replies | 3343 view(s)
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About m_thompson

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About m_thompson
Biography:
Volunteer at the RICM. Working on a PDP-12, PDP-8/I, 8/L, 8/e, PDP-9, 11/34a, and 11/44.
Location:
Rhode Island
Interests:
Vintage minicomputers.
Occupation:
Engineer

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Member of the Rhode Island Computer Museum
http://www.ricomputermuseum.org

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