Teletext and to pad out the fixed packet. The vertical caption position is determined by the packet address. In the case of the Ceefax and ORACLE systems and their successors in the UK, the teletext signal is transmitted as part of the ordinary analog TV signal but concealed from view in the Vertical Blanking Interval (VBI) television lines which do not carry picture information. The teletext signal is digitally coded as 45-byte packets, so the resulting rate is 7,175 bits per second per used lines (41 7-bit 'bytes' per line, on each of 25 frames per second). A teletext page comprises
ORACLE (teletext) By the mid-2000s, however, all of the Jobfinder services had ended. For a short period in 1987, prior to the start of 24-hour broadcasting on ITV, a selection of teletext pages were broadcast in-vision prior to the start of TV-am. These pages mostly consisted of news and information about TV-am. ORACLE began to disappear at 23:31:09 on 31 December 1992, with the outer border of pixels turning black. This process continued until 23:55:55 when only a white square was left, with the text ORACLE gone 1978-1992. It was then replaced by the service from Teletext Ltd. ORACLE did not carry