20 Oct
2023
20 Oct
'23
4:46 p.m.
On Fri, Oct 20, 2023 at 12:11 PM Jon Elson via cctalk
<cctalk(a)classiccmp.org> wrote:
On 10/20/23 03:59, Michael Thompson via cctalk wrote:
DD11-PK is for 11/34 (top two slots for CPU). PDP-11/04 uses standard
DD11-DK (single-board CPU, doesn't need special slots).
The 11/20 is entirely different. It has three 4-slot backplanes for
CPU boards with "random" wiring and Unibus out on AB of final slot.
It would be unusual but not impossible to see the 11/20 CPU backplane
assembly outside of a BA11-C cabinet.
If one had 12 DEC backplane blocks, one could make a replacement but
it would be quite an undertaking. Might be easier to make a PCB-based
replacement with modern connectors. Could also upgrade power input
scheme while at it.
-ethan
The RICM has an empty 11/20 chassis and the power
supply. All it needs is
the processor backplanes. Is there any chance you have a set of backplanes
available?
I have a DD11-PK backplane (Part No. 70-11523) with a few
bent pins. None are bent so badly they can't be
straightened. From 11/04 or 11/34. Free if you pay shipping.