This Serial Port 2 (SP2) adapter will allow you to use a Micro SD Card to load Swiss and the other software on the SD card without sacrificing a Memory Card Port and is a faster BUS than the EXI BUS used in the Memory Card Ports.
This adapter is only usable on the earlier Game Cube models like the DOL-001 which have the actual SP2 socket unlike the later models which the socket is missing entirely.
The adapter sits flush with the console bottom and allows you to easily access the SD Card from the side of the console. The adapter will not sit properly with the Serial Port 1 (SP1) Cover and will either need to be removed or you will have to trim the SP1 cover on the back end to make it sit properly.