public ALU() {

        OP1 = new Register("OP1", 20, false);
        OP2 = new Register("OP2", 20, false);
        RES = new Register("RES", 20, false);
        RES1 = new Register("RES1", 20, false);
        RESlong = new Register("LongResult", 40, false);

    }