[Sideband]

I remember when I was at Philips, they marketed a VHS machine with a teletext decoder and made a great deal of the fact that this enabled deaf people to record subtitles on 888 along with the program. The machine would effectively embed the subtitles into the video recording with the advantage that they could be played back on any other video (since the subtitles were then part of the video recording). The machine could also be used as a teletext receiver and used with a non-teletext set.

They also marketed an S-VHS machine that recorded the teletext signal 'on the fly' with the video recording so to speak so that the recording could be played back on any TV with teletext and the TV would respond to the recorded text signal as if it was live. It could be quite interesting playing a two year old tape, switching to teletext and seeing old news items from when the tape was recorded. 888 could also be selected for subtitles.