My 1973 computer experiments

I used a British Elliott 903 computer with 8 kilowords of 18-bit ferrite core memory. The assembly language program that I wrote filled up a fair fraction of the memory. The system that I looked at was a 2D cellular automaton with discrete particles colliding on a square grid. Had I not been concerned with physics-like conservation laws, or had I used something other than a square grid, the teleprinter output that I generated would have shown randomization. (See page 999.)