In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

It works like this:
  Say you were outputting bits at twice the colorburst rate.
  And lets say the colorburst was output as 0,1
  When you draw the screen if you output the same as the colorburst 0,1 you get green.
  If you output the opposite 1,0 you get purple.
  If you output all lows 0,0 of course you get black.
  If you output all highs 1,1 you get white.

  Now let's say you output at 4 times the colorburst rate.
  So the colorburst is 0,0,1,1
  Like above 0,0,1,1 = Green; 1,1,0,0 = Purple, 0,0,0,0 = Black; 1,1,1,1 = White
  And 1,0,1,0 & 0,1,0,1 = Gray (the frequency is too high for colorburst so it get's averaged as gray).
  0,0,1,0 is sensed as green with a lower amplitude (dark green)
  0,1,1,1 is sensed as green with a higher amplitude (light green)
  0,1,0,0 is sensed as purple with a lower amplitude (dark purple)
  1,1,0,1 is sensed as purple with a higher amplitude (light purple)

  All other combinations are sensed as a phase shift to the color burst given a range of colors.

Bean.

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