Sega Dreamcast Emulators work really well. I recall when it first came out, people thought they would rush to stores to buy it, but the games were weak and there was not much support for it. Even though it out did the N64 in terms of graphics, the N64 was something that everyone wanted to have, including a Play Station. Sadly, I can say this was Sega's last great attempt at the ultimate gaming machine.

Below, are a list of emulators by rank order. Ensure to research the emulator that you are using. Note also that some emulators allow the use of plugins. These plugins help speed up the emulator by producing better graphics and sound. Try all the emulators because even older ones may work better depending on your CPU configuration.