The TF-101 is a format controller for the TD-116 Text Display. It has controls for the text color, background color and text size.
Format information is passed from the TF-101 to the TD-116 using a Torpedo protocol.
Each color is controlled using three CV/Knob combinations, controlling the Red, Green and Blue components separately. A full-color LED on the TF-101 indicates the color mix selected.