The implementation of a Monte Carlo code for simulations of liquid cry
stal lattice models on the Quadrics massively parallel SIMD supercompu
ter is described. The use of a Quadrics with 512 processors is proving
essential in studying the nematic-isotropic phase transition to an un
precedented level of accuracy using more than 10(6) particles. Here so
me tests on the Lebwohl-Lasher model with and without an applied held
are presented.