CLRSELDI
bus_space_write_1(iot, ioh, CLRSINT0, CLRSELDI | CLRSELDO);
ahd_outb(ahd, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO
ahc_outb(ahc, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO);