Subj : Restoration of a 1978 PDP-11/34A - Help would be nice
To   : All
From : Andreas Zahrl
Date : Mon Feb 03 2025 13:55:44

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 experiences with a PDP-11/34A?

Regards
Andreas 

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

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