For those who have no idea what this is (like me 5 minutes ago).
Sega teamed up with Nintendo to develop a GameCube-based arcade platform. Bolstering their ranks was Namco, another coin-op stalwart with tons of arcade veterans.
Three companies, one mission: Triforce.
The Triforce hardware is built around a stock GameCube motherboard, with two Triforce-specific boards attached to it: the AM-Baseboard and AM-Mediaboard.
As of Dolphin 2512-395, Triforce support is here!
The article is very long and contains a lot of history and stuff.