  We study the effect of isospin-dependent nuclear forces on the pasta phase in
the inner crust of neutron stars. To this end we model the crust within the
framework of quantum molecular dynamics (QMD). For maximizing the numerical
performance, a newly developed code has been implemented on GPU processors. As
a first application of the crust studies we investigate the dependence of the
particular pasta phases on the isospin dependence of the interaction, including
non-linear terms in this sector of the interactions. Our results indicate that
in contrast to earlier studies the phase diagram of the pasta phase is not very
sensitive to isospin effects. We show that the extraction of the isospin
parameters like asymmetry energy and slope from numerical data is affected by
higher-order terms in the asymmetry dependence of the energies per particle.
Furthermore, a rapid transition from the pasta to a homogeneous phase is
observed even for proton-to-neutron ratios typical for a supernova environment.
