Unoriented minimal type 0 strings

We define a family of string equations with perturbative expansions that admit an interpretation as an unoriented minimal string theory with background D-branes and R-R fluxes. The theory also has a well-defined non-perturbative sector and we expect it to have a continuum interpretation as an orientifold projection of the non-critical type 0A string for (c) over cap = 0, the (2, 4) model. There is a second perturbative region which is consistent with an interpretation in terms of background R-R fluexs. We identify a natural parameter in the formulation that we speculate may have an interpretation as characterizing the contribution of a new type of background D-brane. There is a non-perturbative map to a family of string equation which we expect to be the (c) over cap = 0 type 0B string. The map exchanges D-branes and R-R fluxes. We present the general structure of the string equations for the (2, 4kappa) type 0A models.