The current eMac 1.25 ghz model and the 1 ghz model (that I have) will do it using the same video/tv adapter. The info I can find for earlier models is not clear but appears to indicate those models will only support a second monitor, not a TV. The difference seems to be that the 700 and early 800 mhz models used NVidia graphics where the revision 2 800 and all later models use ATI graphics.