FERN.COM
                                --------

                          By S.Booth (c) 1989

       Syntax : FERN [B]

       This program displays a picture of a fern on the graphics screen and
   does this by using a method known as Iterated Function Systems which are
   a kind of fractal geometry.

       The remarkable thing about the example shown is that the fern shown
   is built up from a set of only 28 numbers, plus a few extra to place the
   picture on the screen at the right place and in the right scale.

       The IFS method mentioned above is a way if taking a shape, working
   out a set of numbers for reproducing it, and throwing away the original
   data. The resulting numbers when passed through the IFS algorithm
   produce a close approximation of the original.


       Key functions
       -------------

       + zooms in on the fern.
       - zooms out of the fern.

       <Up arrow> moves the fern up.
       <Down arrow> moves the fern down.
       <Left arrow> moves the fern left.
       <Right arrow> moves the fern right.

       S will start over again.
       Q will exit the program.

       Any other key will re-draw the image from the beginning.


   Note : The higher the zoom factor the longer it takes to create anything
          recognizable. At a zoom of 16 it takes about 3 hours on a 1512
          to produce a good image as opposed to around 3 minutes for the
          same quality on the default values.

       Resolution is vastly better in black & white, if you wish to run the
   program in black & white enter FERN B at dos as the program defaults to
   colour.