Additional changes in local news content came during the 1980s and 1990s; in January 1989, WSVN in Miami became the first to adopt a news-intensive programming format; rather than fill its schedule with syndicated content as other Fox stations did at the time it joined that network, Ed Ansin (owner of WSVN parent Sunbeam Television) chose instead to heavily invest in the station's news department, and replace national newscasts and late-prime time network programs vacated as a result of losing its NBC affiliation (the byproduct of an affiliation switch caused by CBS and WSVN's former network partner NBC buying other stations in the market) with additional newscasts. This model was eventually replicated by many other stations affiliated with the post-1986 television networks as well as some news-producing independent stations (beginning with Fox's 1994 deals with New World Communications and SF Broadcasting that saw several major network stations change their affiliations), and also resulted in even NBC, CBS, and ABC affiliates adopting similar scheduling formats (tweaked to account for the larger amount of network programming that those networks carry). In 1990, WEWS-TV in Cleveland conceived a concept known as the "24-Hour News Source" (which has its origins in a news format used by short-lived Boston independent station WXPO-TV when it signed on in 1969), in which supplementary 30-second long news updates were produced at or near the top of each hour outside regular long-form newscasts during local commercial break inserts shown within network and syndicated programming. The format spread to other U.S. television stations (most notably, WISH-TV in Indianapolis, one of the few remaining users of the concept), most of which eventually disposed of the hourly update format by the early 2000s.