After my time, but originally the adig was selected as a fixed cycloid via a rotary switch on the remote panel. The xyi data was connected through the adig board. There's a block diagram that shows the adig connected as a image rotation, spiral, and audiomod source too. All of those except rotation look to have been selected via rotary switch in the diagram. As I've mentioned before, it got harder and harder to do the shows, and harder and harder to learn to be a laserist as time and modifications went by...
"There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso