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  • m_thompson's Avatar
    Today, 12:36 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We finally got the DECtape controller on the PDP-9 working. Time to write an ADSS DECtape and see if we can get an operating system to boot. There...
    87 replies | 11856 view(s)
  • m_thompson's Avatar
    September 18th, 2019, 03:50 AM
    m_thompson replied to a thread Weird error in my 8M in DEC
    I have found a few unsoldered component leads in DEC boards that worked fine for many years and then decided to stop working.
    3 replies | 181 view(s)
  • MattisLind's Avatar
    September 17th, 2019, 11:12 PM
    A well designed cache mechanism would probably help a lot. Many old designs were very memory oriented. The TMS9900 is one design. A good idea when...
    10 replies | 214 view(s)
  • m_thompson's Avatar
    September 17th, 2019, 04:00 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    D15: 0->WINDOW D14: (100)->C0-2 D13: C-SYNC D12: MK BLK START D11: MK DATA D10: MK BLK END D09: MK END D08: MKTK Error This shows MK BLK...
    87 replies | 11856 view(s)
  • MattisLind's Avatar
    September 15th, 2019, 06:33 AM
    I first tested the 74LS04, 74LS32 and 74LS138 in the chip tester and they verified fine so no obvious problems there. Although I replaced them with a...
    1071 replies | 168704 view(s)
  • MattisLind's Avatar
    September 15th, 2019, 02:41 AM
    I have now put the xtidecfg utility on a floppy along with the binary, ide_xt.bin. Fiddled around in the menus and tested the autoconfigure. But...
    1071 replies | 168704 view(s)
  • MattisLind's Avatar
    September 15th, 2019, 01:39 AM
    The GW XTIDE rev 3. Oops! This is something I didn't do. I just programmed the EEPROM in my EPROM programmer. Will look into use of...
    1071 replies | 168704 view(s)
  • MattisLind's Avatar
    September 14th, 2019, 11:56 PM
    Need some assistance on how to best troubleshooting why I cannot get my two XT-IDE rev 3 boards working. I bought bare boards and populated them...
    1071 replies | 168704 view(s)
  • m_thompson's Avatar
    September 12th, 2019, 03:43 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We connected the logic analyzer to the TC02 Window Register and found that the Mark Track is being read correctly and the data is shifting through...
    87 replies | 11856 view(s)
  • MattisLind's Avatar
    September 9th, 2019, 09:01 AM
    There should be a number of unused NCR tapes left. They were still in plastic bags when I got them. Came from a guy in Morocco! But storage in the...
    19 replies | 536 view(s)
  • m_thompson's Avatar
    September 9th, 2019, 03:37 AM
    You also need to have switch 0 on when you run the BIN loader so that it will use the serial console port. If switch 0 is off the BIN loader will try...
    18 replies | 490 view(s)
  • m_thompson's Avatar
    September 8th, 2019, 07:22 AM
    I have an Infoserver 150 with a CDROM in the main chassis, and a storage expansion chassis holding a TZ30 tape drive, running V3.5 software. The...
    16 replies | 524 view(s)
  • m_thompson's Avatar
    September 6th, 2019, 11:34 AM
    The RICM has an NCR 8250. The boards look about the same size as the ones in the 399. This system has a cassette deck, and a stack of cassettes that...
    19 replies | 536 view(s)
  • MattisLind's Avatar
    September 6th, 2019, 02:04 AM
    The problem I had with Verbatim T300 in a TU60 is that he original pressure pad is made of foam with a thin sheet of filt on it. The foam is not as...
    19 replies | 536 view(s)
  • m_thompson's Avatar
    September 5th, 2019, 07:57 AM
    I have an InfoServer, so I probably have the installation media. I will look for it.
    16 replies | 524 view(s)
  • m_thompson's Avatar
    September 3rd, 2019, 03:47 AM
    m_thompson replied to a thread PDP-12 at the RICM in DEC
    Anders, I did not diagnose the problem correctly. The Core between 2000-2777 did not work. OS/8 would load correctly and run, but would not...
    5 replies | 363 view(s)
  • m_thompson's Avatar
    September 2nd, 2019, 09:14 AM
    m_thompson replied to a thread PDP-12 at the RICM in DEC
    Replacing the G221 in slot C08 got the memory working again. Now the serial console is not working...
    5 replies | 363 view(s)
  • m_thompson's Avatar
    September 2nd, 2019, 07:48 AM
    m_thompson replied to a thread PDP-12 at the RICM in DEC
    Ah, its a core memory problem. The Core from 2000 to 2777 is always 0000. The JMS instruction @2675 to the routine that fixes the JMP instruction @...
    5 replies | 363 view(s)
  • m_thompson's Avatar
    September 1st, 2019, 07:27 AM
    m_thompson replied to a thread PDP-12 at the RICM in DEC
    The PDP-12 passes MAINDEC-8I-D01C Instruction Test 1, but fails fails MAINDEC-8I-D02B Instruction Test 2. It gets stuck in an loop at 0001 executing...
    5 replies | 363 view(s)
  • m_thompson's Avatar
    August 28th, 2019, 03:38 AM
    m_thompson replied to a thread TU56 H716 power fireworks in DEC
    DEC also had problems with the fuse holders on the 8/e power supply, so I can understand there reluctance to install fuses were they might not be...
    5 replies | 280 view(s)
  • m_thompson's Avatar
    August 26th, 2019, 04:13 AM
    m_thompson started a thread PDP-12 at the RICM in DEC
    The PDP-12 at the RICM broke a few weeks ago, and I finally had a chance to look at it. When first powered up it will boot and run OS/8 from the...
    5 replies | 363 view(s)
  • m_thompson's Avatar
    August 23rd, 2019, 12:29 PM
    Very nice!
    7 replies | 462 view(s)
  • MattisLind's Avatar
    August 23rd, 2019, 10:28 AM
    Acetone can probably also be used. It will also dissolve PVA. But it has a much lover boiling temperature. Around 50 degrees centigrade while...
    19 replies | 849 view(s)
  • m_thompson's Avatar
    August 23rd, 2019, 08:04 AM
    When we disassembled the VR14 on the PDP-12 the front glass was only attached over about 10% of the surface so we could easily remove it.
    19 replies | 849 view(s)
  • MattisLind's Avatar
    August 23rd, 2019, 06:42 AM
    I have successfully used butylacetate to dissolbe PVA in my VR201. Used a ink cartridge syringe to inject butylacetate inbetween the CRT and the...
    19 replies | 849 view(s)
  • MattisLind's Avatar
    August 23rd, 2019, 06:05 AM
    When I restored my TU60 I happened to find idler tires for a tape recorder which had the correct dimension. It worked very well!
    24 replies | 1653 view(s)
  • m_thompson's Avatar
    August 23rd, 2019, 03:38 AM
    The RICM has a TU60 with melted rollers. Please post your results with getting the rollers replaced.
    24 replies | 1653 view(s)
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