  We investigate the phase diagram of isospin asymmetric matter at T=0 in the
two flavor Nambu-Jona-Lasinio model. Our approach describes the single nucleon
as a confined quark-diquark state, the saturation properties of nuclear matter
at normal densities, and the phase transition to normal or color
superconducting quark matter at higher densities. The resulting equation of
state of charge neutral matter is discussed.
