Bit late but eh, seems retropie/orangepi can be put on the retrocade. Theres a dev on youtube channel, 'PSYCHO TUBE Official' who has it running and theres a download too. Its a pre-built image and whilst emustation loads fine, some of the games/consoles crash out. There is plenty that works mind so it seems retropie can be done. Tried a vanilla orangepi retropie build and does not work, so theres prob allot more too it. Still, promising to see development happening