public void handler() {
            int t,r;
            t = IDXBYTE();
            r = (m6800.b + t + (m6800.cc & 0x01)) & 0xFFFF;
            CLR_HNZVC();
            SET_FLAGS8(m6800.b,t,r);
            SET_H(m6800.b,t,r);
            m6800.b = r & 0xFF;
        }