I work for adelphia (soon to be comcast). Every channel will be digital or high-definition within a few years, per order of the F.C.C.. But if the channel itself doesn't broadcast their shows in H/D, the cable company can't send it out that way. That's why if you notice, channels 4,5,6, etc. only broadcast their shows in H/D after 8:00 or so, its because it costs more money to send it out that way. So they only choose to show them in H/D during primetime hours. Hopefully that helped.
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