  The analytical theory for the voltage-current characteristics of the large
inductance (L>100 pH) high-T_c DC SQUIDs that has been developed previously is
consistently compared with the computer simulations and the experiment. The
theoretical voltage modulation for symmetric junctions is shown to be in a good
agreement with the results of known computer simulations. It is shown that the
asymmetry of the junctions results in the increase of the voltage modulation if
the critical current is in excess of some threshold value (about 8 microAmps).
Below this value the asymmetry leads to the reduction of the voltage modulation
as compared to the symmetric case. The comparison with the experiment shows
that the asymmetry can explain a large portion of experimental values of the
voltage modulation which lie above the theoretical curve for symmetric DC
SQUID. It also explains experimental points which lie below the curve at small
critical currents. However, a significant portion of these values which lie
below the curve cannot be explained by the junction asymmetry.
