m where K is an invariable constant. This special arithmetic unit is also suitable for other computations e such as multiplication, division, and the conversion between binary and mixed radix number systems. However, only the trigonometric algorithms used in this computer and the instrumentation of these algorithms are discussed in this paper. INTRODUCTION HE CORDIC computing technique was de- veloped especially for use in a real-time digital computer where the majority of the computation involved the discontinuous, programmed solution of the trigonometric relationships of navigation equations and a hi gh solution rate for the trigonometric relationships of