VXI Prototyping Modules are used as a quick way to interface all types of circuits to the VXIbus. ICS's Model VXI-5500 Prototyping Module contains a message-based interface and a large grid area for the user's prototype circuits. This application note describes how ICS’s VXI-5500 Proto- typing Module was used to interface two Miniature Speech Enhancement Units (MSEU) to the VXIbus.