To enter color cycling mode, press "c" while you have a picture on the screen. Then, to start cycling, press "c" again. This rotates the palette. Press "Esc" to leave color cycling mode.

While you are in color cycling mode, you can change the following:

Speed of rotation - press the cursor pad up or down arrows

Number of steps per screen update - press number keys 1 through 0

Replace each color with a randomly selected color - press "enter"

Cycle random color bands into the palette - press "F" keys "F2" through "F10" (F2 gives the narrowest bands, F10 gives the widest).

Change the direction of rotation - press "+" and "-" keys