Teletext
Teletext (a TV information retrieval service developed in 1976) uses a 3-bit RGB, 8-color palette.
Teletext has 40×25 characters. The top and bottom rows along with the first column are reserved. Every character cell has a background color and a text color. Graphics are built with a set of 2×3 pattern characters. Thus, the actual graphic surface is 78×69 blocky pixels.
A newer version of this standard defines a high resolution mode, but it is not supported by the vast majority of TV broadcasting networks nor TV sets manufacturers.
Read more about this topic: List Of 8-bit Computer Hardware Palettes