Abstract: A circuit for determining the length of an instruction including apparatus for providing a sequence of instruction bytes greater than a single instruction length, rotator apparatus for selecting a sequential number of instruction bytes for decoding commencing at a byte which begins a first instruction, control apparatus for operating the rotator, and apparatus responsive to a decoded length value derived from the first instruction for causing the control apparatus to cause the rotator to rotate to the beginning of a next instruction.

Abstract: The specification discloses a method and apparatus for determining the length of variable-length instructions that appear sequentially in an instruction stream without differentiation. The apparatus may be used to facilitate parallel processing of such variable-length instructions by a computer system.

Abstract: A circuit for generating a pair of clock pulses of opposite phases each having the same frequency as the frequency of an input signal generated by a crystal oscillator including apparatus for generating first and second pair of signals at half the frequency of the input signal generated by a crystal oscillator, the signals of each pair being of opposite phase to one another; apparatus for comparing a first signal of the first pair signals with the one of the signals of the second pair of signals which is normally out of phase therewith to produce an output signal only when the two signals are in phase; apparatus for comparing the second signal of the first pair of signals with the one of the signals of the second pair of signals which is normally out of phase therewith to produce an output signal only when the two signals are in phase; apparatus utilizing one of the output signals to lengthen the duty cycle of one of the first pair of signals of opposite phases and the other of the output signals to shorten t