def instruction_OR(self, opcode, m, register):
        """
        Performs an inclusive OR operation between the contents of accumulator A
        or B and the contents of memory location M and the result is stored in
        accumulator A or B.

        source code forms: ORA P; ORB P

        CC bits "HNZVC": -aa0-
        """
        a = register.value
        r = a | m
        register.set(r)
        self.clear_NZV()
        self.update_NZ_8(r)
Performs an inclusive OR operation between the contents of accumulator A
        or B and the contents of memory location M and the result is stored in
        accumulator A or B.

        source code forms: ORA P; ORB P

        CC bits "HNZVC": -aa0-