Retrochallenge 2009
      Summer Challenge
      Mark Wickens


      The VAX has been working again this evening - some more images from the program.
      This time, I concentrated on zooming in on an interesting part of the image and
      then varying the threshold at which the program evaluates convergence. I've
      changed it to produce an image with a fixed number of pixels which means the
      real and imaginary axes don't suffer from rounding errors which were skewing the
      larger images.

      Over the last couple of days I'd like to get the program working with command
      line arguments so that I don't have to re-assemble it every time to change a
      parameter. I might also implement the other convergence tests mentioned in the
      Pickover book.

      The last image has had some artistic flair added via GIMP!