Note that the actual way these colors will look will depend on how they are used!  This is especially true for those colors in the center section of the picture above.  Generally, they will look brighter and better than they do in this picture.

Each color is an 8-bit number with chroma and luminance info:

Color Bits:  7654_3210

The Graphics_Palette example (shown above) gives the two digit hexadecimal representation of the color that the mouse is over. 

Bits 7, 6, 5, and 4 specify the chroma (color)

Bit 3 specifies color (1) or B&W (0) mode

Bits 2, 1, and 0 specify the luminance (brightness)

The values "001" and "111" are not allowed.  So, there are only 6 levels available.

The value "000" produces a saturated color.

Graphics_Palette example layout:

For the colored swatches, the chroma varies from 0 to F across the screen from left to right.

Bit 3=1 for colors.

The top line has luminance at "000" to give saturated colors.

The next lines are luminance values from 6 down to 2.

For the B&W swatches, bits 7..3 are 0 and luminance is varied from 2 to 7 across the screen.

Info on how the colors are arranged as groups of four to form a long and how the longs are used by the tile driver are the same as give for VGA Colors