📚 Year 11 OCR Computer Science: Core Concepts Revision | Year 11 OCR 计算机：核心知识点梳理
This article provides a comprehensive review of the key topics in Year 11 OCR Computer Science, helping students consolidate their understanding of systems architecture, data representation, programming, and more. Whether you are preparing for mock exams or final assessments, these notes highlight essential concepts and common pitfalls.
本文为 Year 11 OCR 计算机科学课程的核心知识点进行全面梳理，帮助学生巩固系统架构、数据表示、编程等重点内容。无论备考模拟考试还是最终评估，这些要点将突出关键概念与常见误区。
1. Systems Architecture | 系统架构
The Central Processing Unit (CPU) is the brain of the computer. It follows the Von Neumann architecture, consisting of the Control Unit (CU), Arithmetic Logic Unit (ALU), and various registers. Key registers include the Program Counter (PC), Memory Address Register (MAR), Memory Data Register (MDR), and Accumulator (ACC). The CPU processes instructions through the fetch-decode-execute cycle.
中央处理器 (CPU) 是计算机的大脑。它遵循冯·诺依曼架构，由控制单元 (CU)、算术逻辑单元 (ALU) 和多个寄存器组成。重要寄存器包括程序计数器 (PC)、内存地址寄存器 (MAR)、内存数据寄存器 (MDR) 和累加
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