 Rainbow originally started the Playboy Channel in 1982 as a joint-venture with Playboy; Cablevision would later sell its share back to Playboy.1983 saw the acquisition of Philadelphia's regional sports and movie network PRISM and sibling PRISM New England, as a joint-venture with The Washington Post Company, with CBS acquiring a stake in 1985.While PRISM New England was rebranded as SportsChannel New England upon the acquisition, the original PRISM retained its identity and format (and eventually gained a sister network in SportsChannel Philadelphia).