             ------- DRCOLOR (Function Key) -------


--  This function key when pressed will signify to the program that
    any figures (lines,curves,circles) to be drawn after this point 
    are to be drawn in the opposite color.  If figures you have been
    drawing have been made up of bright dots, then future figures
    will be made up of dark dots and vice-versa.
 
    NOTE  Pressing of this function key will not cause any apparent 
          change to the screen.

    NOTE  This function may be useful for drawing on painted areas. 
 
--  If you press this function key again you will signify to the program
    to flip the color to draw with back to what it was before you 
    pressed it.

    NOTE  See the COLOR function key if you want to reverse the
          current image on the screen as well as reversing the
          color to draw with.

********* PROBLEMS **********

Because of the use of this function you may encounter a problem where
you just used a LINE function for instance and the line does not appear
to have been drawn.  It looks like nothing happened.  What can actually
be happening is that you drew a line but it was in the same color as
the background, rendering it invisible.  If this happens,  merely use
the DELLAST function to delete the invisible line and press the DRCOLOR
function key so you may draw the line again in a visible color.  Then
use the LINE function again to redraw the line.

    NOTE  This can also happen with CURVE and CIRCLE.
isible 