From Intellivision Wiki
The STIC divides its color set into two subsets, the Pastel Colors (numbered 8 through 15) and the Primary Colors, numbered 0 through 7. The Primary Colors are so named because they include Red, Green and Blue, and some colors that are roughly direct combinations of those--Tan and Dark Green being the main exceptions. The following table illustrates the colors, along with an approximation of the Intellivision's color. (The HTML color values match the settings used in jzIntv. They should not be considered canonical.)
|Color Number||Color Name||Example|
Note: The color examples may not display if your web browser does not support the BGCOLOR attribute on table cells.