Here are catalogue pages for the some of the many signal conditioning boards that were made.
Arcom originally designed a 50-way connector pinout, but another company made a 60-way superset which they named the Signal Processing bus.
If designing new boards, I would use the 60-way connector because has an even number of pins either side of the board centre line. If using the 50-way connector, place it sits in the subset of the 60-way connector. This will not be symmetrical about the centre line, but that helps keep cabling between the two types free of bends.
![](https://cdn.hackaday.io/images/9553731703957920219.png)
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![](https://cdn.hackaday.io/images/8410071703958498923.png)
![](https://cdn.hackaday.io/images/2595051703958519712.png)
![](https://cdn.hackaday.io/images/209281703958621001.png)
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![](https://cdn.hackaday.io/images/1115971703958664624.png)
![](https://cdn.hackaday.io/images/449271703958695462.png)
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