1.0 Introduction and 1.1 objectives

Computer is the most powerful tool man has ever created. Computers are used in almost every working place in the modern times that is school, colleges, offices, railways, banks, industries, hospitals etc. The word “computer” comes from the word “compute” which means to calculate. So a computer can be considered as a calculating device that can perform arithmetic operations at a high speed but more accurately.

Computer is a digital electronic storage device, which accepts data and set of instructions, manipulates it, and retrieves the information at very high speed. In other wards we can say that a computer is a data processing device which following specific instructions, perform a sequence of operations to achieve a desired result.

In this unit we will discuss about personal computer (PC) and its components. From here onward, the words PC and computer are used interchangeably.

1.1 OBJECTIVES

After going through this unit, you will be able to:

• describe the Main components of Personal Computer (PC);

• discuss the role of CPU, CU and ALU;

• describe the various types of memory such as RAM, ROM, PROM and EPROM etc.;

• define and explain the various types of I/O (Input and Output) devices; and

• define the various types of peripheral devices.

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