The ZL4xARM_PROTO is a universal PCB designed to facilitate development with STM32 microcontroller-based single-board computers (compatible with ZL40ARM, ZL41ARM_F217, ZL41ARM_F207, and ZL41ARM_F4). The universal prototyping area on the ZL4xARM_PROTO board allows for quick and easy assembly of various prototype systems, enabling integration with modern, high-performance microprocessor systems (Cortex-M3 and Cortex-M4).