计算机英语第二单元第一课时.ppt

Chapter 2 Computer components and principals 2.1The Basic Structure of Computer Text The computer is an entity that interacts in some way with its external environment. All of its linkages to the external environment can be classified as peripheral devices and communication lines. Chapter 2 Computer components and principals 2.1The Basic Structure of Computer Text The internal structure of the computer includes four main structural component. 1)Central Processing Unit (CPU): Controls the operation of the computer and performs its data processing function. It is often simply referred to as processor. 2)Main memory: Stores data Chapter 2 Computer components and principals 2.1The Basic Structure of Computer 3)I/0:Move data between the computer and its external enviroment. 4)System Interconnection: Some mechanism that provides communication among CPU, main memory and I/O. Chapter 2 Computer components and principals 2.1The Basic Structure of Computer Sometimes, the input/output and secondary storage units are called peripheral. This term refers to the fact that although they are not a part of the CPU, they are often located near it. Mainframe: Means for placing the computer motherboard and other key components of the container (mainframe). Optical Disk: All the preceding technologies for improving the capacity of disks are pushing magnetic media to their density limitation. Chapter 2 Computer components and principals 2.1The Basic Structure of Computer Text Hard Disk: The hard disk drive provides increased storage capabilities and faster access. It was developed by IBM in 1973 Keyboard: A keyboard is a device that converts keystrokes into codes that can be electronically manipulated by the computer. Display or Monitor: It is often called monitor, which is one of the output parts of the system. It is a device that used to view the computer’s output. Chapter 2 Computer components and principals 2.1The Basic Structure of Computer Text Mouse: The mouse is a unique devic