GUS_IOH3_OFFSET
if (bus_space_map(iot, iobase+GUS_IOH3_OFFSET, GUS_NPORT3, 0, &ioh3))
if (bus_space_map(sc->sc_iot, sc->sc_iobase+GUS_IOH3_OFFSET, GUS_NPORT3, 0,
#define GUS_MIXER_SELECT (0x506-GUS_IOH3_OFFSET) /* read=board rev, wr=mixer */
#define GUS_BOARD_REV (0x506-GUS_IOH3_OFFSET)