MO_FILTER_EVEN
cx_andor(MO_FILTER_EVEN, 0x7ffc7f, value); /* preserve PEAKEN, PSEL */
cx_set(MO_FILTER_EVEN, 0x00002020);
cx_clear(MO_FILTER_EVEN, 0x00002020);
cx_andor(MO_FILTER_EVEN, mask, value);