BBC Micro depth, resolution and memory economy. In the first models, the OS and applications were left with the RAM left over from the display mode. Mode 7 was a Teletext mode, extremely economical on memory and an original requirement due to the BBC's own use of broadcast teletext (Ceefax). It also made the computer useful as a Prestel terminal. The teletext characters were generated on board, for use with monitors and TV sets without a Teletext receiver. Train time displays at UK stations were driven by BBC Master computers in this mode until around the late 1990s. Mode 7 used only
Channel Four Television Corporation service to provide schedules, programme information and features. The original service was called 4-Tel and was provided in collaboration with Oracle. In 1993, with Oracle losing its franchise to Teletext Ltd, the running of 4-Tel was taken over by Intelfax, and in 2002 was renamed FourText. In 2003, Channel Four awarded Teletext Ltd a 10-year contract to run an ancillary teletext service, named Teletext on 4, on a number of its channels. The service was provided on both Channel 4 analogue and digital television services, "Channel 4", "E4" and "More4". This has now been ceased and Teletext is no longer