I have playable roms of all of those titles. Setting up an emulator is easy. Figure out what emulator is the most popular (for example from
emulator-zone.com) and get it. Then get the roms (games) you want, for example from a torrent. Then fire up the emulator and load the game. Il Duce is really making it seem harder than it is (imo). Emulation now is usually pretty much like opening a file in a program, for example opening a text file in notepad.
With a bit of work, you can set up a computer with a media center that you can run your games from. To do that, I've set up XBMC with Advanced Launcher on my own computer. Then I run it on the telly and control it from my couch with my XBOX controller.
Here's a selection screen for different systems :
And here's a random title when browsing Super Nintendo Games :
When using this, I don't run emulators manually. That's all going on in the background. I just choose the game I want and press a button.
Of course it's also a nice way to play your movies or music. I love it!
You'd like my arcade emulator setup then