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Nintendo patent explains Switch 2 Joy-Cons’ “mouse operation” mode
(arstechnica.com)
This is a most excellent place for technology news and articles.
The ports were all on the same bus! You can send signals meant for any of the three of them into any of the three of them and it'll work.
Well, the memory card slots and Serial Ports 1 and 2 anyway. The Game Boy Player connects via the parallel port.
https://www.copetti.org/writings/consoles/gamecube/