Components of Motherboard

Adapter: It’s a circuit board that is attached with port and by this processor will control and communicate others devices.

Port: It will help us to attach the devices. Different types of port are: Serial, parallel, USB etc.

PCI Slot: It will allow to attach extra device with PC such as: TV card,NIC(LAN Card) etc.

Power Supply: Pc needs four types of DC voltages +5, -5, +12, -12. Power supply unit will convert AC to required Dc voltage.

Display Adapter: It works with mo monitor. Ex: VGA, SVGA ,CGA etc.

Code

Code
• Code reduces the volume of data, so data manipulation becomes easier and less error involved with data.
• Types of code:
• (1)BCD Code: It is used to represent numbers in computer system. It is 4 bit code. It is a weighted code and 8-4-2-1 weight is given to every number. Example: The BCD of 13 is: 00010011
25 = 00100101
• (2)Alphanumeric Code: It is a 8 bit code.It is used to represent alphabets, digits, symbols, special symbols tic etc. 4 bit of this code is zone bits and 4 bit is 8-4-2-1 ,Ex: ASCll,EBCDIC
Z Z Z Z 8 4 2 1
• (3)Uni code: It is a 16 bit code. It is used to represent special languages like Bengali, Hindi, Chinese, Arabic etc.

Number system

Number system
• Decimal Number: 0,1,2,3,4,5,6,7,8,9
• Base of decimal Number :10
• Binary Number: 0,1
• Base of Binary Number: 2
• Octal Number: 0,1,2,3,4,5,6,7
• Base of Octal Number: 8
• Hexadecimal Number: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
• Base of Hexadecimal Number : 16
Conversation Of Numbers: Binary to Decimal
(101)2
101= 1x(2)0 =1 , 0x(2)1=0,1x(2)2=1x4 = 5 (101)2 = (5)10

Types of Computer

Types of Computer

• Based on signal: Two types :

• 1.Analog Computer: It follows analog signal .Ex. Speedometer 2.Digital Computer: It follows digital signal .Ex. Personal computer
• Based on capacity:
• 1.Super computer :It’s largest computer in size and capacity. It may have more than thousand processors. It is used in weather forecasting, complicated calculations and research ez.
• 2.Mainframe Computer : less are in size and capacity than the super computer. It is used in organizations where many users need to work with same data. It is found in railway, air ticket reservation and in large organization like bank ez.
• 3. Minicompurter: it’s smaller in size and capacity than supercomputer and mainframe computer. It’s used in organizations for the serving the input and output needs of 100 users at a time. Usually minicomputer can be found in many organizations as a server computer.
• 4.Workstation:Special computer used for scientist and engineers is called workstation

• 5.Micro computer : Micro computer is used according to size and capacity it’s the smallest .Ex. Personal computer.

Other types of computer

• Laptop computer: Special computer which has the same capacity as microcomputer

• PDA: Personal Digital Assistant. It’s used for taking notes, tracking data, agenda ez.It’s also called palmtop.
• Tablet PC: It’s created by Microsoft .It’s a special computer which has same functionality as microcomputer.

Computers definition

Computer: Computer is an electronic device that takes data as input. Processes the data and finally it produces the output based on input.

Input----Processing ---- Output.

Components of computer System---

1.Hardware

2.Software

3.Humanware.

4.Operational procedures .

1.Hardware : All the physical component of computer system which we can touch is called as Hardware. Ex: Cpu, Monitor etc.

2.Software: Collection of program is called software.Ex.Operating syste,,ms office etc.

3.Humanware;Human involvement with computer system is called humanware.3 types of human ware .

1.Analyst.

2.programmer

3.Operator.

1.Analyst: The person who has vast knowledge and who analyses a system makes a design to convent manual system to computerize system is analyst.

2.programmer: The person who has less knowledge than analyst and who writes program for assistant is called programmer.

3.Operator: The person who has least knowledge and who only operates a system is called operator.

4.Operational procedures : The rules that will define how to use computer system. How to make change in hardware and software etc.