Abstract: Communication apparatus is operative to switch communication dynamically between itself and a selected one of a predetermined plurality of mating communication devices of different configurations. A memory is provided for storing a plurality of different sets of configurables with each set of the plurality corresponding to a communication configuration associated with a corresponding mating communication device of the predetermined plurality. Each set of configurables being indexed in the storing means by a unique memory address. A controller is also provided and is responsive to a command signal to select an index memory address for use by the communication apparatus to functionally configure itself in accordance with the set of configurables of the memory storage corresponding to the index memory address selected by the command signal. An entry device may be coupled to the controller for entering the index memory addresses of at least two sets of configurables into a portion of memory.