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Be sure your posts conform to Site Rules
We also have a Discord server and an IRC channel #tasvideos at irc.libera.chat...
(not the exact model, but close enough.)
If you get them as a USB controller you don't need an adapter, and they actually have software included to install and in Mupen under input settings it shows up as an option.
And don't forget that there's the TAS input plugin, which for some N64 games can completely replace a controller.