EKA1（Epoc Kernel Architecture）是Symbian OS的第一代核心（kernel）。EKA1提供了先占式多工（pre-emptive multitasking）以及记忆体保护（memory protection），但并不属于即时处理（real-time）的保证，这会造成有些功能无法精确被执行，而且EKA1的装置驱动程式模型是单一执行绪（single-threaded）。目前EKA1已被EKA2所取代。
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