Why does Comcast cable not have HD channels?

I have Comcast cable tv in South Florida and recently connected a hd TV and now all the channels are different?

• I have` the cable without a box. I connect directly to the wall. Now some of the channels are the same but as`an example the history channel used to be channel 65 and now its 104-001. There are more channels I never had`before and there are repeats as well. How do I punch in a dashed channel on my remote? How do I get my old numbers or at least ones without dashes?

• Answer:

  if you Had a analog tv thas normal because hd tvs give you digital channels that you don't get whit analog tvs so don't worry and you have to get familiar whit the dashes because that is hd tv and there is not way to change that