 The VGA color system is backward compatible with the EGA and CGA adapters, and adds another level of indirection to support 256 8-bit-colors.CGA was able to display 16 fixed colors, and EGA extended this by using 16 palette registers, each containing a color value from a 64-color palette.The default EGA palette values were chosen to look like the CGA colors, but it's possible to remap each color.