You sure the original AppleTV was 1080p? I had one, but back then my TV was only 720p anyway, so I have no idea if it went up to 1080p. The reason I doubt it was 1080p is that all the HD content on the iTunes store is 720p so why bother supporting 1080?
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"Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars." - Martin Luther King, Jr.