case 0x40:
		boards++;
		rtapi_print_msg(RTAPI_MSG_INFO, "Univ. Stepper Controller\n");
		rv1 += export_UxC_digin(slot, bus);
		rv1 += export_UxC_digout(slot, bus);
		rv1 += export_USC_stepgen(slot, bus);
		rv1 += export_encoders(slot, bus);
		bus_slot_code = (busnum << 4) | slotnum;
		need_extra_dac = 0;
		need_extra_dout = 0;
		for ( n = 0; n < MAX_BUS*8 ; n++ ) {
		    if ( extradac[n] == bus_slot_code ) {
			need_extra_dac = 1;
			extradac[n] = -1;
		    }
		    if ( extradout[n] == bus_slot_code ) {
			need_extra_dout = 1;
			extradout[n] = -1;
		    }
		}
		if ( need_extra_dac && need_extra_dout ) {
		    rtapi_print_msg(RTAPI_MSG_ERR, "Can't have extra DAC and DOUT on same slot\n");
		} else if ( need_extra_dac ) {
		    rv1 += export_extra_dac(slot, bus);
		} else if ( need_extra_dout ) {
		    rv1 += export_extra_dout(slot, bus);
		}		
		/* the USC occupies two slots, so skip the second one */
		slotnum++;
		break;