public void handler() {
            int t,r;
            t=IMMBYTE();
            r = (m6800.a + t) & 0xFFFF;
            CLR_HNZVC();
            SET_FLAGS8(m6800.a,t,r);
            SET_H(m6800.a,t,r);
            m6800.a = r & 0xFF;
        }