The color interface was introduced in 1991.
The first redesign of the original keyboard, the Trackball allowed for easy and quick Terminal functionality.
(Tech At Bloomberg, 2017)
Belk, H. (2017) 2017 Corporate Leader Bloomberg L.P., aiga.org, 20 March. [link]
Tech At Bloomberg (2017) A look back: The Bloomberg Keyboard, techatbloomberg.com, 25 May. [link]