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by ooterness 886 days ago
RGMX has a video series on a lot of the low-level SNES functions. If you've ever wanted to know how Mode-7 works, it's great.

The video below goes over the controllers, Super Scope, mouse, etc. A brief discussion of the multi-tap starts around 16:00. You are correct that it leverages the spare pins.

https://www.youtube.com/watch?v=2Dw7NFm1ZfY