Please read Paul´s statement about Iterated dynamics:teratedynamics is a very faithful and certainly capable port of Fractint. The functionality is virtually identical, or at least very close, to the DOS Fractint. Mouse control of the zoom box has not been implemented, but the zoom box can be controlled with keystrokes, and of course video is done differently. Still, the result is amazing. The code base has been extensively refactored (I have no doubt very much for the better), so it is no longer possible (or at least not very easy) to capture Jonathan's changes to DOS/Linux versions subsequent to Rich's starting point. Mabe there are clues in the code as to which DOS version it is based on. Rich, do you know? The program announces itself as 20.99.8, but that is not any DOS version.