CGA was the first color graphics adapter created by IBM for use in PCs. It supports several graphics modes:
- A 320 x 200 color mode.
- A 640 x 200 monochrome mode.
- Two text modes (40 x 25 and 80 x 25).
- A 160 x 100 mode featuring 16 colors.
The most common mode - the 320 x 200 color mode - supports four colors on screen at once; however, only one of the colors (black by default) is able to be modified. The other three colors are fixed from one of six palette variations (three palettes, each with a high intensity mode).