PS1 on the GameCube
I have been thinking about what else could be put on the Gamecube and the Wii. One of them could be to actually that playstation 1 .iso and reburn them to miniDVDs and play them on your gamecube or wii.
I don't think you can emulate the PS1 with just an SD card. You would just need a modchip or if you have freeloader for gamecube them you could play the games, plus whatever software you is made will have to map out the controller.
I believe what you are looking for is here -> LINK