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By introducing geometric variation in the basic magnetic core toroidal structure, new logic design freedom is achieved and effective decoupling is obtained between different windings linking the same element. By proper interconnection such elements may be used to provide unilateral information-flow properties without the use of explicit unilateral devices such as diodes. A practical system to accomplish this is outlined in this paper. The resulting circuits are relatively fast and inexpensive. Magnetic elements and connecting wires only are required. In particular, single-turn windings may be used in the coupling loops. Furthermore, inherent nondestructive read properties allow a great deal of logic facility. Simple shift register structures and logic elements and circuits are described.