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This video tutorial is a comprehensive revision guide for the OCR J277 specification, focusing on Paper One. The guide aims to cover all aspects of the syllabus, beginning with Unit 1.1.1, which discusses the architecture of the CPU. The CPU's primary function is to perform the fetch-decode-execute (FDE) cycle. The three stages of this cycle include fetching the instruction from RAM to the CPU, decoding the instruction for understanding, and executing the instruction. This cycle is repeated continuously. Additionally, it covers common CPU components, specifically highlighting the role of the control unit (CU) in decoding instructions.