I live in the Philadelphia television market. Some more background on Prism: They were a premium movie network like an HBO, but the network also broadcast Philadelphia pro sports, Philadelphia Big Five college basketball and WWF professional wrestling from the Spectrum. The show also ran a weekly sports talk show called "The Great Sports Debate," which featured local radio personalities from the WIP all-sports station in Philadelphia.
More than the sports, though, I can remember that Prism used to run some movies late Friday/Saturday nghts that a 16-year-old or 18 year-old male would find rather, um, interesting.
The network met its end when Comcast bought Prism's parent company and started an all-sports network in town that continues to exst to this day.
http://en.wikipedia.org/wiki/PRISM_(TV_network)