1. Forum
  2. FSXnet
  3. FSX RETRO

  • Restoring a PDP-11/34A from 1978

    From goto_KCM@21:1/218 to All on Mon Feb 3 13:57:09 2025
    Hey there.

    I got an PDP-11/34A herein the museum and trying to restore that heavy beast. Started with cleaning and dismantle the whole thing.
    The a friend of mine restored the PSUs inside while i did the cleaning of the backplanes and cards.

    First try was just the DD11-PK Backplane with UNIBUS Terminator and tried to read and write registers. Worked out well about 10 minutes when the 7 segment displays goes blank and only one Zero was visible on the right side.

    Restarting the PDP doesn't seem to work and the console was not longer responsible. I could feel IC27, a DM85S68N RAM Chip, was getting quite hot. So i soldered that IC out. Ordered some of these RAMs on eBay but still waiting for them to be delivered.

    Someone here have experience with a PDP-11?

    Regards
    Andreas

    ... Kautzner Computer Museum - https://kcm.or.at

    --- Mystic BBS v1.12 A49 2024/05/29 (Raspberry Pi/32)
    * Origin: KCM BBS (21:1/218)
  • From Malvinas@21:4/167 to goto_KCM on Tue Feb 4 10:38:44 2025
    I got an PDP-11/34A herein the museum and trying to restore that heavy beast. Started with cleaning and dismantle the whole thing.

    You got quite a piece of History there...

    Cheers,
    Malvinas

    Islas Malvinas, siempre Argentinas!

    ... Islas Malvinas, siempre Argentinas.

    --- Mystic BBS v1.12 A47 2021/12/25 (Windows/64)
    * Origin: The Vault BBS (21:4/167)
  • From tenser@21:1/101 to goto_KCM on Fri Feb 7 03:56:00 2025
    On 03 Feb 2025 at 01:57p, goto_KCM pondered and said...

    I got an PDP-11/34A herein the museum and trying to restore that heavy beast. Started with cleaning and dismantle the whole thing.

    Very cool. Congrats.

    Someone here have experience with a PDP-11?

    I think you're going to have a lot more luck on the
    cc-tech mailing list, honestly.
    https://www.classiccmp.org/cctech.html

    --- Mystic BBS v1.12 A48 (Linux/64)
    * Origin: Agency BBS | Dunedin, New Zealand | agency.bbs.nz (21:1/101)
  • From goto_KCM@21:1/218 to tenser on Fri Feb 14 07:53:06 2025
    I think you're going to have a lot more luck on the
    cc-tech mailing list, honestly.

    Hey, thanks.
    Will give it a try!

    Regards
    Andreas

    ... Kautzner Computer Museum - https://kcm.or.at

    --- Mystic BBS v1.12 A49 2024/05/29 (Raspberry Pi/32)
    * Origin: KCM BBS (21:1/218)