Removed one more resistor - now colors are bright and solid:

This is walk through all colors in Hue order (except for grays) with intermediate dithered colors (27 colors total):

The same thing on DOSBox +60 degrees CGA simulation ( XORLib has port to PC with CGA ) :

This is preparation for Mandelbrot Set viewer ;)

P.S. Source code of this program:

https://gitlab.com/shaos/xorlib/blob/master/examples/colorman.c