Teletext systems the country being closed captioning, TV Guide On Screen, and Extended Data Services (XDS). A version of the European teletext standard designed to work with the NTSC television standard used in North America was first demonstrated in the US in 1978 by station KSL in Salt Lake City, Utah, premiered a teletext service using Ceefax. They were followed by American television network CBS, which decided to try both the British Ceefax and French Antiope software for preliminary tryouts for a teletext service, using station KMOX (now KMOV) in St. Louis, Missouri as a testing ground. CBS decided on Antiope and
Teletext hardware that could download pages of up-to-date news, reports, facts and figures targeting U.K. agriculture. The original idea was the brainchild of Philips (CAL) Laboratories in 1970. In 1971, CAL engineer John Adams created a design and proposal for UK broadcasters. His configuration contained all the fundamental elements of classic Teletext including pages of 24 rows with 40 characters each, page selection, sub pages of information and vertical blanking interval data transmission. A major objective for Adams during the concept development stage was to make Teletext affordable to the home user. In reality, there was no scope to make an