             ------- COLOR (Function Key) -------


--  This function key when pressed will redraw the figure on the
    screen, but it will do it in the negative image (reverse video).

--  This means that all dots on the screen that were dark will now be bright
    and vice-versa.

--  Pressing this function key again will return the drawing to the way 
    it was.                

    and vice-versa.

--  Pressing this function key again will return the drawing to the way 
    it was.     