David wrote:

Tim you might want to take a look at this suite of benchmark in software for dos https://dosbenchmark.wordpress.com/

Well it would be interesting to see if those benchmarks also show DOSBox is faster than native DOS. However the main interest in this context is how the speed of various fractal generators on various platforms and in various versions compare. For that the answer appears to be exactly what Rich Thomson said. The default Mandelbrot on both Iteratedynamics (a.k.a FractInt for Windows)  and Manpwin is essentially instantaneous, way under a second on my machine. So a more ambitious fractal that takes much longer will be needed for a reasonable test, and I am sure the native Windows versions will end up being much faster exactly as Rich said. 

Iteratedynamics 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.

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-David

David W Riccio
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