  We study the fatgraph expansion for the Complex Matrix Quantum Mechanics
(CMQM) with a Chern-Simons coupling. In the double-scaling limit this model is
believed to describe Type 0A superstrings in 1+1 dimensions in a Ramond-Ramond
electric field. With Euclidean time compactified, we show that the RR electric
field acts as a chemical potential for vortices living on the Feynman diagrams
of the CMQM. We interpret it as evidence that the CMQM Feynman diagrams
discretize the NSR formulation of the noncritical Type 0A superstring. We also
study T-duality for the CMQM diagrams and propose that a certain complex matrix
model is dual to the noncritical Type 0B superstring.
