We describe a computer program that simulates the microcanonical Ising model at a peak speed of 100 mil lion spin updates per second on a single processor of a Class VII supercomputer. The program is vectorized and multispin coded for lattices of all sizes and dimensions by introducing multiple copies for lattices smaller than 128 on a side. Autocorrelations are measured to monitor the effects of critical slowing down and to calculate dy namical critical exponents.
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