[quote name='jalu6']Its just going to look a little blurry. Your 1080p TV is 1080 pixels wide. Those old systems weren't meant to be played on anything higher rez than an 480i set. So basically, you're TV is going to try and spread those 480 pixels over 1080 pixels creating a bluring effect.
For an idea of what it looks like, if your PC has an LCD monitor, set your resolution to 800x600. You'll see what I mean. Some people keep an old CRT set around JUST to play their classic systems.[/quote]
I'm one of those people. I have 27" CRT just for my older systems. Unless it's a 480p game, even last gen games can look bad. I am planning on getting a cheap used CRT HDTV to play last gen games via component. I heard they look pretty nice that way.