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  • m_thompson's Avatar
    October 19th, 2019, 01:36 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Maybe we can make a video if it booting tomorrow.
    111 replies | 15054 view(s)
  • MattisLind's Avatar
    October 19th, 2019, 01:24 PM
    MattisLind replied to a thread PDP-9 at the RICM in DEC
    Fantastic work! Really would like to see the DECtapes spinning, the TC02 flickering and the sound of the ASR33 in a video. Please!
    111 replies | 15054 view(s)
  • m_thompson's Avatar
    October 19th, 2019, 11:59 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We connected an ASR33 Teletype to the console port on the PDP-9 today. Much more fun than the VT220.
    111 replies | 15054 view(s)
  • jackrubin's Avatar
    October 18th, 2019, 08:33 PM
    jackrubin replied to a thread PDP-9 at the RICM in DEC
    Good stuff!
    111 replies | 15054 view(s)
  • m_thompson's Avatar
    October 18th, 2019, 04:14 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I modified resttd8e to work with PDP-9 SIMH DECtape images and was able to make physical DECtapes. Today we got the PDP-9 to boot the ADSS V4E...
    111 replies | 15054 view(s)
  • jackrubin's Avatar
    October 16th, 2019, 11:43 AM
    Thanks for sharing this - it seems like VCF-Berlin gets better and better. You can't have too many PDP-8's!
    2 replies | 125 view(s)
  • jackrubin's Avatar
    October 16th, 2019, 09:08 AM
    jackrubin replied to a thread VCFMW "Family of 8" playlist in DEC
    Thanks for taking the initiative, Richard - a rich and rewarding resource! :>)
    1 replies | 116 view(s)
  • jackrubin's Avatar
    October 15th, 2019, 06:58 AM
    Palbart.exe runs from the command line on a Windows machine, at least through Win7. I haven't tried it on Win10. Read the docs at Mike's link above....
    5 replies | 182 view(s)
  • m_thompson's Avatar
    October 14th, 2019, 10:09 AM
    Palbart https://www.pdp8online.com/ftp/software/palbart/ You can run the binary on a real PDP-8 or under SIMH.
    5 replies | 182 view(s)
  • jackrubin's Avatar
    October 14th, 2019, 09:14 AM
    Wait, it gets better. The author presented at VCF-Berlin (on 13 October - yesterday!) and the video of his talk is already online - in English -...
    3 replies | 125 view(s)
  • jackrubin's Avatar
    October 14th, 2019, 07:19 AM
    Oscar Vermeulen just shared an interesting project on the pidp-8 list - a B cross-compiler that emits native PAL assembler code -...
    3 replies | 125 view(s)
  • m_thompson's Avatar
    October 13th, 2019, 01:22 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I got the PDP-9 to format DECtapes today. The clock that generates the timing track was running a little slow, so it ran off the end of the tape...
    111 replies | 15054 view(s)
  • jackrubin's Avatar
    October 11th, 2019, 08:23 PM
    jackrubin replied to a thread PUTR OS8 file size limit? in DEC
    Welcome to SQUISH! This is invokes a PIP option to essentially copy a disk to itself, consolidating empty space in the process. Check it out in the...
    14 replies | 469 view(s)
  • MattisLind's Avatar
    October 11th, 2019, 08:31 AM
    I happen to come across this picture which matches (i think, I have no idea of the IBM numbering scheme) four of the shiny metal cubes in the PSU: ...
    12 replies | 281 view(s)
  • MattisLind's Avatar
    October 11th, 2019, 05:52 AM
    Thanks for all ideas! I have replaced the chopper transistors with 2N6547 which are a quite common SMPSU transistor in DEC equipment. Should be...
    12 replies | 281 view(s)
  • MattisLind's Avatar
    October 9th, 2019, 11:09 PM
    I add a picture to show what I am fighting: I have checked resistors in circuit. There are none that are terribly out of spec. Of course I...
    12 replies | 281 view(s)
  • MattisLind's Avatar
    October 9th, 2019, 02:06 AM
    A friend of mine got an IBM 5110 which was dead and I am trying to help out. It blows fuses. First he told me the transformer was short circuit....
    12 replies | 281 view(s)
  • m_thompson's Avatar
    October 8th, 2019, 09:00 AM
    The Rhode Island Computer Museum has an Integrated Server 3006 which is very similar to the Multiprise 3000. We could use any I/O cards that you...
    5 replies | 251 view(s)
  • m_thompson's Avatar
    October 8th, 2019, 08:54 AM
    m_thompson replied to a thread PUTR OS8 file size limit? in DEC
    Could you use SIMH to read the PAL source like it was a paper tape image and save it on the diskette image?
    14 replies | 469 view(s)
  • MattisLind's Avatar
    October 7th, 2019, 08:09 PM
    MattisLind replied to a thread Pdp1123 rl02 question in DEC
    RL02 (and RL01) uses embeddded servo information between tracks. This info cannot be written by the RL02 itself but has to be written at the factory....
    5 replies | 292 view(s)
  • jackrubin's Avatar
    October 7th, 2019, 06:21 PM
    The summer Vintage shows are all over now and it's time to get back to cold-weather projects. I exhibited the LD-12 at VCF Midwest but unfortunately...
    223 replies | 22244 view(s)
  • m_thompson's Avatar
    October 6th, 2019, 05:33 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    BQT, I used PIP-10 to extract files from a PDP-10 KA10 DECtape a few weeks ago. I should look at the code.
    111 replies | 15054 view(s)
  • m_thompson's Avatar
    October 3rd, 2019, 03:50 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I am learning way more than I wanted about dumprest for the PDP-9. The dumptd8e_18 that is on that is on Dave's WWW page does not fiddle with the...
    111 replies | 15054 view(s)
  • m_thompson's Avatar
    September 30th, 2019, 03:55 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We tried to format a DECtape on the PDP-9 using the paper tape that Mattis punched for us. The formatter program loads and runs, but doesn't like the...
    111 replies | 15054 view(s)
  • m_thompson's Avatar
    September 29th, 2019, 08:07 AM
    The MEMORY ADDRESS test is supplied in RIM format and uses a very limited set of instructions.
    5 replies | 263 view(s)
  • jackrubin's Avatar
    September 29th, 2019, 05:25 AM
    jackrubin replied to a thread PDP-9 at the RICM in DEC
    Hello Dawson! Get ready for an RI winter - don't forget the sunscreen!
    111 replies | 15054 view(s)
  • m_thompson's Avatar
    September 29th, 2019, 05:12 AM
    2, IF is Instruction Field and DF is Data Field. 3, If you loaded the MAINDEC into memory field 1, then you would set the Switch Register to 1. 3,...
    5 replies | 263 view(s)
  • m_thompson's Avatar
    September 29th, 2019, 05:09 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Well, that didn't go so well. I started making a PDP-9 disassembler for paper tapes. It gave me a listing of the ADSS bootstrap tape that came with...
    111 replies | 15054 view(s)
  • m_thompson's Avatar
    September 26th, 2019, 04:51 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    The normal PDP-8 & TD8E DECtape formatter knows how to create PDP-9 DECtapes. It took a few tries, but I now have three blank PDP-9 DECtapes. This...
    111 replies | 15054 view(s)
  • jackrubin's Avatar
    September 26th, 2019, 04:31 PM
    Great to see another tape spinning, though it's a bit more modest than the DECtape on RICM's PDP-9 :>)
    33 replies | 2754 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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