BD_DONE
bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD;
param = BD_DONE | BD_EXTD | BD_CONT;
param = BD_DONE | BD_EXTD | BD_CONT;
param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR;
bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD;
if (bd->mode.status & BD_DONE)
bd->mode.status |= BD_DONE;
if (bd->mode.status & (BD_DONE | BD_RROR))