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SAGE was the computer that produced 3D effects in Laserium shows beginning in 1987. It was a separate thing from the Choreographics system. An example of sage graphics is the yellow and green zig zag lines in my tribute to L.A. Woman video. Until recently little was publicly known about the SAGE....

I would assume it is just an analog signal, you might want to take a look at the old OpenLase project by Hector Martin. That should give you some inspiration and technical insight.

Regarding Toccata & Fugue, the real video is available here: https://www.youtube.com/watch?v=dgqoiAIAPXA This version is so much better than my first guess at it, with lots going on to not leave out. Regarding ports printed backwards: A perfect solution I never would have seen. Thank you Roj....