Fairground lighting controllers.

For some random reason I ended up repairing fairground lighting controllers when I was younger (and still do from time to time.) The systems were generally not very well designed and I inevitably ended up building a new system that evolved rapidly into a neat modular one that ended up being used in many British and American rides and themeparks.
Although I don't build controllers any more due to the downturn in the British ride industry, I still have some of the original boards I used which are kept as spares for existing customers.
This video is an insight into how they worked and interconnected.