8-bit works differently from the higher color modes. In 8-bit color you have a palette with 256 colors. This means you can't plot any color, just the ones you have in your palette. If you change a color in the palette, all the pixels using that color changes. The 8 bits just tell the computer which color in the palette to use.
In 16-, 24- and 32-bit color you can specify a color for each pixel, there is no palette. The 16, 24 or 32 bits tell the computer how much red, green and blue the computer should use for each pixel.
Since 8-bit color is so different, it would take a whole new set of functions to handle that mode. It would be like writing the whole graphics system of Blitz again.
And come on, I don't even remember when I last saw a PC running 8-bit color.
In 16-, 24- and 32-bit color you can specify a color for each pixel, there is no palette. The 16, 24 or 32 bits tell the computer how much red, green and blue the computer should use for each pixel.
Since 8-bit color is so different, it would take a whole new set of functions to handle that mode. It would be like writing the whole graphics system of Blitz again.
And come on, I don't even remember when I last saw a PC running 8-bit color.