Abstract: In a multiprocessor data processing system, modules are cascaded by means of intermodule buses. Each module comprises a data processing unit, a first memory, a logic cell array programmable into four input/output interfaces, a second memory and a specialized processing unit such as a digital signal processor (DSP). A first interface, the first memory and the data processing unit are interconnected by a module bus. A fourth interface, the second memory and the specialized processing unit are interconnected by another module bus. A feedback bus connects the second and third interfaces in the last and first modules for constituting a ring. Such a system is particularly intended for image recognition, such as digitalized handwritten digits for postal distribution.