Teletext a plug in circuit board. It took another decade before the decoders became a standard feature on almost all sets with a screen size above 15 inches (teletext is still usually only an option for smaller "portable" sets). From the mid-1980s both Ceefax and ORACLE were broadcasting several hundred pages on every channel, slowly changing them throughout the day. The "Broadcast Teletext Specification" was published in September 1976 jointly by the IBA, the BBC and the British Radio Equipment Manufacturers' Association. The new standard also made the term "teletext" generic, describing any such system. The standard was internationalised as World
Service Information address of the BBC Engineering Information Department. The bulletin would then end with a rundown of the trade test colour films being shown on that particular day. ""And now we are returning to the colour test card and music until "Play School" at eleven o'clock"" would be a familiar closing phrase. "Service Information" bulletins generally lasted an average of two or three minutes but on Wednesday 25 August 1971, the longest "Service Information" bulletin known was aired, which ran for 11 minutes. A Monday to Friday "Tuning Information" bulletin was added to BBC2 in the heyday of colour coming to