By the end of 1976, both RCA’s SelectaVision and a N.V. Philips Co./MCA’s Disco-Vision, plan to market their video disc systems in the U.S.

Can current television sets be equipped to play recorded programs that could be purchased and stored like so many hi-fi discs? Manufacturers have been competing for a decade to be first to provide a practical answer. Trouble is, both videotapes and films are too expensive to produce for the mass…