1. A computing system comprising: first arithmetic operation means for performing a first arithmetic operation on a first n-bit unsigned binary operand and a second n-bit signed binary operand to produce an n-bit unsigned binary result; first positive overflow means, coupled to the first arithmetic operation means, for assigning a value of 2.sup.n -1 to the n-bit unsigned binary result when there is a positive overflow; and, first negative overflow means, coupled to the first arithmetic operation means, for assigning a value of 0 to the n-bit unsigned binary result when there is a negative overflow.