there is no saturn emu, as much as I wish there was, there isn't. Most xbox's can't read cd-r's (only those with the samsung drive in them can, like mine). Once you have a mod chip in you have to flash it with a bios that will allow you to run unsigned code (those bios's are illegal btw, so don't ask for them, as are most xbox binaries, even the homebrew). With that said, once oyu have done both of those things you can install a different dashboard that will allow you to run 3rd party apps that are on the hard drive (you can also shove a bigger hard drive in there). The most popular dashboard (or atleast the one I seem to hear the most about and use) is evolutionX, which has a ftp server in it so that you can connect your pc to it to edit and transfer files.