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This article examines the evolution of programmable development boards in the context of dynamic market and technological changes, as well as new approaches to embedded system design. It presents the history of evaluation board development and its impact on engineering, emphasizing the shift from closed ecosystems to open-source software. Particular attention is paid to the role of open source and modular architectures in shaping modern solutions. An important component of this paper is the description of the original OpenCPLC evaluation system, dedicated to microcomputer control systems. The OpenCPLC project illustrates how a layered design approach can increase the flexibility and range of PLC applications in both industry and education. The evolution of development boards indicates a clear trend in which openness and modularity are becoming key factors in determining the future of embedded systems.
