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Expansion Port
From SnesLab
The Expansion Port is the hole on the bottom of the SNES, which peripherals such as the Satellaview can connect to. Pins 1-8 are connected to the SNES Bus. Pins 11~18 are connected to the CPU Data Bus.
It can send IRQs. DOTCK is the dot clock.
The expansion port, in region C3 of the jwdonal schematic