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  • m_thompson's Avatar
    Today, 03:58 AM
    m_thompson replied to a thread Tennecomp and Xebec in DEC
    Thanks very much for scanning and posting the documentation. The RICM has permission from ECRM to distribute the scanner documentation and software.
    5 replies | 471 view(s)
  • m_thompson's Avatar
    Yesterday, 04:13 PM
    I have been working on a Windows GUI program that can read OS/8, ADSS, and LAPS/DIAL SIMH disk and DECtape images. It is far from finished, but...
    4 replies | 81 view(s)
  • m_thompson's Avatar
    Yesterday, 04:03 AM
    The MAINDECs for the TD8E are very comprehensive and complicated so I made some very simple tests for the TD8E. One will copy the console switches...
    13 replies | 184 view(s)
  • m_thompson's Avatar
    August 18th, 2019, 03:17 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I spent some time today chasing an issue with the TC02 DECtape controller where it would interrupt when it shouldn't, and not interrupt when it...
    83 replies | 9916 view(s)
  • MattisLind's Avatar
    August 14th, 2019, 05:37 AM
    I have built several of Jacks extenders. Not with the original DEC connector though but a more standard EDAC connector. The difference is that it is...
    6 replies | 145 view(s)
  • m_thompson's Avatar
    August 12th, 2019, 03:37 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Today was a holiday in RI, so I had some more time to work on the PDP-9. I ran MAINDEC-9A D3BB-PB TC02 Basic Exerciser test #11, TC02 Instruction...
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    August 11th, 2019, 03:39 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We have so much equipment that needs to be restored and made demonstrable...
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    August 11th, 2019, 03:38 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    He is going to URI for grad school, so just a 15 minute drive away.
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    August 11th, 2019, 01:21 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Jack, The PDP-9 helpers are two existing volunteers, and one new young volunteer. Dawson should move here in a few weeks, so can hopefully...
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    August 11th, 2019, 06:06 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We had a very successful day working on the DEC PDP-9 and TC02 DECtape controller. Alex found and replaced a bad diode on the B310 delay line...
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    August 8th, 2019, 03:50 AM
    m_thompson replied to a thread RX8E 74xx clone works in DEC
    Very nice! Omnibus boards are going for very high prices on eBay lately.
    7 replies | 318 view(s)
  • m_thompson's Avatar
    August 6th, 2019, 11:50 AM
    m_thompson replied to a thread DCK11 ChipKit in DEC
    I made a similar Omnibus board and put a combo FPGA-ARM3 on it. It could emulate any peripheral that didn't need DMA. ...
    6 replies | 298 view(s)
  • MattisLind's Avatar
    August 6th, 2019, 06:55 AM
    I once had a set of manual of the UCSD p-system for the Texas Instrument Professional PC. I have scanned them and then some guy in Germany has taken...
    8 replies | 269 view(s)
  • MattisLind's Avatar
    August 6th, 2019, 06:49 AM
    A difficulty with the TU60 is to find tapes that work with it and tapes that last. The original tape had this special notch and also a blank leader....
    12 replies | 590 view(s)
  • m_thompson's Avatar
    August 5th, 2019, 08:13 AM
    The datacenter that I worked in decades ago used 716s as a front-end processors for their Honeywell Level-66 mainframe.
    1 replies | 288 view(s)
  • m_thompson's Avatar
    August 4th, 2019, 09:58 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Happens all the time with these ancient machines.
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    August 4th, 2019, 09:57 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    The memory is working again. The B310 delay line that takes CLK and makes POST CLK\ had a non-monotonic output so the pulse amplifier that takes POST...
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    August 4th, 2019, 04:07 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Yesterday we ran MAINDEC-9A D3BB-PB TC02 Basic Exerciser test #0. This moves the DECtape forward until the TC02 controller finds the End Zone, then...
    83 replies | 9916 view(s)
  • MattisLind's Avatar
    August 3rd, 2019, 08:43 PM
    It is a Sprague 30D 75 UFD 6VDC. https://www.mouser.se/datasheet/2/427/te-1291517.pdf
    14 replies | 1239 view(s)
  • MattisLind's Avatar
    August 2nd, 2019, 11:24 PM
    Remeber that. Did you manage to find that key switch that was missing? Haven’t done much to the boards that you sent me in exchange. Useful as...
    15 replies | 575 view(s)
  • MattisLind's Avatar
    August 2nd, 2019, 12:47 AM
    As far as I understand OS/8 should be able to use TA8E / TU60 as a data device, not system device though. There there are a CAPS-8 package on the...
    12 replies | 590 view(s)
  • MattisLind's Avatar
    July 31st, 2019, 08:31 AM
    It looks like the picture is wider in both horisontal and vertical direction. This can be caused by lower HV voltage. Lower HV can be caused by low...
    14 replies | 1239 view(s)
  • m_thompson's Avatar
    July 28th, 2019, 05:15 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We loaded the paper tape for MAINDEC-9A D3BB-PB TC02 Basic Exerciser that Mattis Lind punched and sent us. We ran test #0, Basic Motion. This test...
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    July 28th, 2019, 05:13 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I tried the MAINDEC-9A D3BB-PB TC02 Basic Exerciser, and it read in OK. I haven't tried the other tapes yet, because the TC02 Basic Exerciser...
    83 replies | 9916 view(s)
  • m_thompson's Avatar
    July 28th, 2019, 05:10 AM
    There is a list of paper tapes that we know about here: http://www.ricomputermuseum.org/Home/equipment/dec-pdp-9 Like Mattis and Anders, I am very...
    6 replies | 375 view(s)
  • MattisLind's Avatar
    July 28th, 2019, 12:45 AM
    MattisLind replied to a thread PDP-9 at the RICM in DEC
    I hope the tapes got punched allright. Those mechanical thing can be a bit finicky some times. Hard to verify the tape by the eye. Reading them in...
    83 replies | 9916 view(s)
  • MattisLind's Avatar
    July 28th, 2019, 12:39 AM
    I somehow missed this post. Thanks for doing the dump! Anyway I got my M7859 working and it turned out there were no problems in the PROM content. In...
    3 replies | 616 view(s)
  • MattisLind's Avatar
    July 27th, 2019, 11:39 PM
    It looks like there are quite a lot of interesting papertapes there. It would be nice if you could make a list of all tapes and compare with what...
    6 replies | 375 view(s)
  • m_thompson's Avatar
    July 27th, 2019, 10:21 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Yay, We replace a transistor on an inverter FlipChip an now the DECtapes move when we send a MOVE command to the TC02 DECtape controller. The...
    83 replies | 9916 view(s)
  • MattisLind's Avatar
    July 26th, 2019, 05:49 AM
    I donít think READY is involved since it goes to a pull and then onto J3. J3 is used when doing microdebugging of the 11/34 CPU and for all normal...
    18 replies | 1260 view(s)
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