EMU_CHAN_CCCA
emu_wrptr(sc, ch, EMU_CHAN_CCCA, 0);
emu_wrptr(sc, v->vnum, EMU_CHAN_CCCA, start | (v->b16 ? 0 : EMU_CHAN_CCCA_8BITSELECT));
emu_wrptr(sc, v->vnum, EMU_CHAN_CCCA, start | (v->b16 ? 0 : EMU_CHAN_CCCA_8BITSELECT));
emu_wrptr(sc, ch, EMU_CHAN_CCCA, 0);
#define EMU_CHAN_CCCA_CURRADDR EMU_MKSUBREG(24, 0, EMU_CHAN_CCCA)