|Oy. A bit too tired to go into too much detail, but the Timewave Zero program is available in Mac or MS/DOS if you want it. Dolphin Software, 48 Shattuck Square #147, Berkley, CA 94704|
As for how McKenna did it? A lot of math. Painful ammounts. He graphed out the number of line changes between hexagrams and plotted this graph upon the SAME graph plotted backwards on itself, which equalled 64 again. He then plotted a graph using THIS graph in the same way trigrams are built. Six graphs, with two larger graphs in the middle, with an even larger graph above it to unify the whole. 6 lines. 2 trigrams. One hexagram. He called this an eschaton, a time-wave particle.
Head exploded yet? Mine pretty much did the first time through... and the second. And the third...
The reason that they chose the mayan calendar as the end-date was that it seemed to fit best with their data. I haven't found a great deal of exposition as to how they came to this date, besdies that they found it fit the best with their data. Seems like it could be Kuhn-levels of tunnel vision, but I love the idea of novelty reaching a critical mass.
I could probably explain more after some sleep... but maybe not.