A numerical lattice simulation technique is presented that is efficient for use on general purpose computers. This algorithm is a combination of the microcanonical simulation introduced by Creutz, and the multilattice coding technique demonstrated by Bhanot et al. The algorithm is tested with the two-dimensional Ising model. We achieve a maximum speed of 660000 Ising spin flips per second (without measurements) on a VAX 11 780. Satisfactory agreement with exact results is found. © 1986.