We present new measurements of branching ratios and CP violation
of neutral and charged charmed mesons with the CDF II detector at Fermilab.
Exploiting the high mass resolution of the CDF tracking system, the
Cabibbo-suppressed decays Do --> K+ K-, Do --> pi+ pi- and D+/- -->
pi-/+ pi+/- pi+/- are well separated from the much larger Cabibbo-favored
decays, even without explicit particle identification, and their branching
ratios have been measured with high precision.  Accurate understanding of
the tracking asymmetries allow us to search for direct CP violation in these
decays by looking for an asymmetry in the decay rate of C = 1 and C = -1
mesons.