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The revision guide covers the OCR J277 specification for paper one, containing essential information for the syllabus. It begins with Unit 1.1.1, which focuses on the architecture of the CPU. The primary role of the CPU involves executing the fetch-decode-execute (FDE) cycle: fetching instructions from RAM, decoding them to understand their purpose, and executing the instructions. This cycle is repeated continually. The guide also discusses key CPU components, specifically the Control Unit (CU), which is responsible for decoding instructions. Overall, the guide aims to serve as a comprehensive resource for Paper One revision.