Time-of-day clock

A time-of-day clock system employing digital magnetic logic is described. The system design is directed toward the problem of minimizing the number of drivers commonly associated with large-scale magnetic logic systems. The clock system derives its basic count rate from a time-base generator which is realized through truncation of a maximal length linear pseudorandom sequence generated by a feedback shift register. The basic count rate is accumulated in a set of accumulators having semibidirectional properties derived from prime control logic to minimize the number of driver sections required. The design of a clock system based on a 0.01-hour time base derived from the 60-Hz power line frequency and accumulator capacity sufficient for 365 days is given.