DESKTOP COMPUTER

 (DESKTOP COMPUTER P.C. REPAIR AND

           SAFETY PRECAUTIONS)

| (INTRODUCTION)

Computer is a fast 100% accurate result giving electronic machine, which on the basis of the data stored or by performing algebraic and logical operations of the data received from the user (Ourput) is provided.

The word computer is derived from compute which means

Calculation. Hence computer means computing machine.

picture computer

User input gives data to the computer with the help of devices. The data received by the computer is processed according to the given instructions and the result is provided to the user by the output devices. Computer is a machine that gives 100% accurate results. The computer gives wrong results only when, either wrong data has been input by the user or wrong instructions have been given for processing. The computer can be drawn as follows

program /

input unit data

(Input Unit)

Central Processing Unit

Result

Output Unit 10atpur Unit)

(Result)

Figure 2: Data Flow

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PRECAUTIONS)

Dane CouTER PC. REPAIR AND

SAFETY

HISTORY OF COMPUTER (STORT OF COMPUTER)

(Nei is the mother of invention, today computer is the result of Xie. Man has been on the path of development in ancient times. This is the result of today's computer development sequence of computer can be divided into three parts. Development of Computer )

middle age

modern age

(Dark Age 5000BC-1890AD)

(Middle Age 1890-1944)

(Modern Age 1944 - Continued)

, 1.1 Dark Ages (DARK Acs 5000 BC- 1800 AD)

The history of all the computers of this time electro-mechanical (Electro-mochanice) started with Abacus. Before this, humans used to do calculations by scratching on small stones or metals.

1. Abacus

Abakan is considered to be the oldest machine of calculation which was made in China 3000 years ago. A is still being used for primary education in the Soviet Union and in India as well.

The instrument consists of a wooden sham that remains in two parts. The upper part is called Heaven and the lower part is El. Horizontal rods in this order are fixed with round beads. These beads are counted by sliding them from one side to the other. The topmost line represents the second line tens third line hundred digits.

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