A feedback shift-register scaler

A scaler is described which utilizes a ferrite-core shift register with linear-logic feedback. Where m is the number to be scaled by, the mechanization of this type of scaler requires an n-stage shift register, where 2
^r−1
≥k; an m-input modulo-2 adder where m is even; and detection of a specified combination of states (word). The algorithm for designing a scaler to count to any l is given and the mechanization of such a scaler with a pair of 2-core 2-diode-per-bit shift registers is described; this scaler also uses an all-magnetic modulo-2 adder. One of the shift registers contains the true contents and the other the complement contents: this yields the added advantage of presenting a constant load to the 2-phase drivers, and permits constant voltage drive. The only active elements this type of scaler requires are in the 2-phase driver circuits and in the word detector. The operating frequency'is variable from 0