Quadtree Corp of Milpitas and Valid Logic Systems Inc of San Jose, California have announced that Quadtree Designers’ Choice software behavioral models are now available for the ValidSIM simulation environment. The Designers’ Choice models will run on Valid’s wide range of electronic design automation systems, including the DEC VAXstation family, the Sun Microsystems’ Sun-3 Series of workstations and Valid own’s SCALDsystem workstations. The company’s component libraries for design validation will now be further augmented by Quadtree’s intention of providing software models for commercial logic simulators. Prices for Quadtree’s Designers’ Choice models range from $500 to $5,000, depending upon the complexity of the model. Designers’ Choice models are compatible with ValidSIM releases 3.0 and upwards. The models are available directly from Quadtree Corp, and are offered on 30 days’ delivery.