The weight distributions of some product codes

General expressions are derived for the weight distributions of the binary product codes S-1 circle times S-m2, R-m1 circle times R-m2, S-m1 circle times R-m2, E-m1 circle times S-m2, and E-m1 circle times R-m2, where S-m is the [2(m) - 1, m, 2(m-1)] simplex code, R-m is the [2(m), m + 1, 2(m-1)] first order Reed Muller code, and E-m is the [m, m-1, 2] even weight code.