IB Edexcel Computer Science: Mind Map Quick Revision | IB Edexcel 计算机：思维导图速记

📚 IB Edexcel Computer Science: Mind Map Quick Revision | IB Edexcel 计算机：思维导图速记

Mind maps are powerful visual tools that help you organise and memorise key computing concepts for IB and Edexcel Computer Science exams. This revision guide uses a mind map approach to cover essential topics, grouping related ideas into branches for quick recall. By linking concepts logically, you can reinforce your understanding and improve exam performance.

思维导图是强大的视觉工具，可帮助你组织和记忆IB与Edexcel计算机科学考试的关键概念。本复习指南采用思维导图法覆盖核心主题，将相关知识点按分支分组以便快速回忆。通过逻辑关联概念，你能加深理解并提高考试成绩。

1. Computer Systems and Architecture | 计算机系统与架构

The central processing unit (CPU) is the core of any computer system. It consists of the Control Unit (CU), which directs operations and manages the fetch-decode-execute cycle; the Arithmetic Logic Unit (ALU), which performs calculations and logical operations; and various registers. The fetch-decode-execute cycle begins with the Program Counter (PC) holding the address of the next instruction. The address is moved to the Memory Address Register (MAR), and the instruction is fetched into the Memory Data Register (MDR). It is then copied to the Current Instruction Register (CIR) for decoding. The CU decodes the instruction and coordinates the execution, often using the Accumulator (ACC) to store intermediate results. Clock speed, measured in GHz, determines how many cycles are executed per second, directly affecting performance.

中央处理器(CPU)是任何计算机系统的核心。它由控制单元(CU)、算术逻辑单元(ALU)和各种寄存器组成。控制单元指导操作并管理取指-译码-执行周期；ALU执行计算和逻辑运算。取指-译码-执行周期从程序计数器(PC)开始，它保存下一条指令的地址。该地址被传送到内存地址寄存器(MAR)，指令被读取到内存数据寄存器(MDR)。然后它被复制到当前指令寄存器(CIR)进行译码。CU译码指令并协调执行，通常使用累加器(ACC)存储中间结果

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