EMU_TCBS
emu_wrptr(sc, 0, EMU_TCBS, 0); /* taken from original driver */
emu_wrptr(sc, 0, EMU_TCBS, 0);
emu_wrptr(sc, 0, EMU_TCBS, 0); /* taken from original driver */
emu_wrptr(sc, 0, EMU_TCBS, 0);