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PDP 11/40 Industrial 11 model

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  PDP 11/40 Industrial 11 model by Bill Degnan - 04/06/2015 21:52
PDP 11/40 expansion chassis
Digital made a PDP 11/40 "industrial11" model. The front panel coloring is different but otherwise operates the same as the standard unit.


PDP 11/40 industrial 11 bottom chassis card cage
Pictured here is a view of the bottom card cage with the main CPU and memory module. Click image for larger view.


PDP 11/40 industrial 11 expansion chassis
The top expansion chassis of the industrial 11 is also chock full of cards including more memory. Click image for larger view.


More photos

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  Card Inventory by Bill Degnan - 08/22/2015 21:11
Cards Removed from system before transport and cataloged below exactly "as was". I noticed that the expansion backplane cable was disconnected from the main CPU, not sure why. I marked all cables as to what card they came out of and what slot. This system has 6 16K Core RAM modules (MJ11) = 96K

BOTTOM CABINET:
Starting from slot 1 (closest to the front panel)
1: empty
2: M7253
3: M7232 (1-4) M7237(5)M787 (6)
4: M7231
5: M7233
6: M7235
7: M7234
8: M7236
9: M7800 (3-6)
9/11: M981 (1-2)
11: M8293 (3-6)
12: M7259 (1-2)
13: G114
14: H217C
15: G235
16: G235
17: H217C
18: G114
19: M9283 (3-6)
19/21: M9202 (1-2)
21: M8293 (3-6)
22: M7259 (1-2)
23: G114
24: H217C
25: G235
26: G235
27: H217C
28: G114
29 M8293 (3-6)
29/31: M9202
31: GC (D)
32: M7809
33: M9300 YB (1-2)
33: GC (4)
34: M9300 (1-2)
34: M7800 (3-6)

TOP / EXPANSION CABINET
1: M8293 (3-6)
2: M7259 (1-2)
3: G114
4: H217B
5: G235
6: G235
7: H217C
8: G114
9: M8293 (3-6)
9/11: M9202 (1-2)
11: M7297 (3-4)
11: 7296 (5-6)
12: M7295
13: M7294
14: M5904 (3-4)
15: M5904 (3-4)
16: M5904 (3-4)
17: GC (4)
18: GC (4)
18: M9300 (1-2)
19/21: M9202 (1-2)
19: GC (4)
21: M7248 (3) M7212 (4) M7212(5)M7212 (6)
22: M784 (5) M783 (6)
23: M7213 (3-4) M785 (5) M785 (6)
24: EXPANSION CABLE (1-2)
24: "small card" (4), M785 (5) M785(6)
26: M9700 (3), M105 (4), M7226 (5-6)
27: M7821 (4)
28: M117 (4)
29: M002 (4)
31: CABLE FROM 24
31: M7258 (3-6)
32: M8094
33: M8098
34: M7800 YA (3-6)
31: -
32: -
33: -

Whew!

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  Front Panel Repairs by Bill Degnan - 12/22/2016 07:52
Digital PDP-11/40 industrial/11 front panel
Pictured is the front panel with the cover removed. I spent a few hours cleaning before I got to this point, the entire system is pretty rough. Click image for larger view.


Digital PDP-11/40 industrial/11 dead LED front panel lights
This photo shows the 4 lights that do not function. Technically this is a camera trick, but for illustrative purposes, work with me. Click image for larger view.


Digital PDP-11/40 industrial/11 rear view repairs
I removed the dead bulbs and replaced them with bulbs from a donor front panel, that was used in a DEC system but not branded "Digital". Pictured are a few LED cathode/anode pins, poking through the back of the front panel board. Click image for larger view.


Digital PDP-11/40 industrial/11 LED replacement lights installed
The lights from the donor panel have a slightly different resistance and they shine less than the originals. The panel traces are kind of brittle and I decided to leave them as is rather than remove and put in something else. The picture exaggerates the difference, live it's not so bad in normal light, one would not notice during use. Click image for larger view.


Digital PDP-11/40 and industrial/11 front panels next to each other differences
Here is a picture of the front panel plates from the regular 11/40 and the industrial 11. The Rear Click image for larger view.


So far I have tested the CPU cards and amazingly they all work in a basic way at least using the front panel. I spent a lot of time cleaning the front panel, making good progress.

Click for more photos

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