Abstract: Apparatus for multiplexing selected information contained in first and sed pulse waveform signals includes an analog switch through which the first signal passes unchanged except for periods during which the switch is caused to be thrown. The first signal has periods of activity and inactivity. Voltage detectors detect pulses in the second pulse waveform well as periods of activity and inactivity in the first waveform. A logic network is responsive to the voltage detectors and produces a signal triggering a multivibrator to throw the analog switch during a period of inactivity in the first waveform to indicate the occurrence of a pulse in the second pulse waveform.

Abstract: An integrated circuit chip for application in a computer for performing h speed arithmetic operations in hardware has hardware for forming a system clock processor circuit, a timer circuit, a program counter and branching circuit; an interrupt processor circuit formed in the chip; an interrupt address random access memory, mathematical computation circuitry and an internal data random access memory. The mathematical computation circuitry includes a circuit for performing combined division and square root operations. The integrated circuit operates on a fixed instruction set and provides the means for performing instruction and operand look-ahead to permit execution of each instruction in a single clock cycle.