ATM switches with multicast and broadcast capabilities are required in order to support B-ISDN multiparty calls and to provide Local Area Networks interconnection to B-ISDN. The GAUSS ASE is an ATM switch that uses the broadcast bus architecture but does not provide multicast capability. It has a number of favorable properties, namely the broadcast bus, output queuing, self-routing method and a limited increase in it's internal speed, it's architecture can be easily modified to provide multicast and broadcast capabilities. This paper presents the simulation results and analysis of the design modification to the GAUSS switch proposed by Rein J.F. de Vrie.