EXCA_ADDRWIN_ENABLE
exca_setb(sc, EXCA_ADDRWIN_ENABLE, map->memenable |
exca_clrb(sc, EXCA_ADDRWIN_ENABLE, mem_map_index[window].memenable);
exca_setb(sc, EXCA_ADDRWIN_ENABLE, map->ioenable);
exca_clrb(sc, EXCA_ADDRWIN_ENABLE, io_map_index[window].ioenable);
exca_putb(sc, EXCA_ADDRWIN_ENABLE, 0);
exca_putb(&sc->exca[0], EXCA_ADDRWIN_ENABLE, 0);