Computer Systems Index

System Analysis and Design

System Analysis and Design

1. System The term system is derived from Greek word systema. The meaning of systema is organized relationship among components. The system is an organization build from many components to obtain desired goals or output. All the components of system are dedicated for system output. In broad sense, there are only two systems: (a) Natural System and (b) Fabricated System (a) Natural System: Our universe is a system. Then all galaxies are sub-systems. There are many systems in nature such as water system, wind system, ecosystem etc. Our body is...

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PC Installation

PC Installation

The term of PC Installation is very rich in itself. The knowledge of hardware and software, both required, for PC Installation. Now a day, mother board is integrated with sound cards, visual cards and much other hardware required for smooth operation of computer. Interested student should join hardware courses in their vicinity to avoid wastage of time. It is a totally practical based technology. The knowledge of PC installation and trouble shooting is necessary for every computer professional to maintain their own computers and peripherals....

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BIOS

BIOS

The BIOS (Basic Input Output System) can be defined as a set of built in software routines. The BIOS controls many of the most important function of the PC, like how it interprets keystrokes, communication through the computer ports etc. it also has the job of testing the computer every time it is turned on. In fact it is responsible for the allocation of system resources. Simply stated the BIOS serves as a link between the hardware and software of your computer. The BIOS cannot be classified as either software or hardware, it is both. Like...

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Interface (Computing)

Interface (Computing)

By definition, an interface is anything that allows two dissimilar systems to work together or communicate. In peripherals such as hard disk an interface is required to provide communication between the computer bus and the hard disk. The most popular interface used in modern hard disks is the IDE (Integrated Drive Electronics) interface, also known as ATA. Another commonly used interface is the SCSI (pronounced skuzzy), which is further divided into SCSI-1, SCSl-2, and SCSI-3.   (a) IDE: The IDE concept was proposed by Western Digital...

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Secondary Storage Devices

Secondary Storage Devices

CD-ROM, DVD, ZIP DISK, JAZ Drive, WORM, Magnetic tapes etc used to store data’s are known as Secondary Memory. Secondary memory can also be called as Backup Memory because they are used to store data and information for future use.     Some of the Secondary Storage devices are described below:  (a) Floppy Disk: In 1972, IBM lunched Floppy diskette in market to store data data and program. Floppy is made up with Mylar plastic or Polly vinyl plastic. It has concentric ring (tracks) and redial sectors to store data. Plastic is...

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Computer Memory

Computer Memory

The computer memory is a data storing devices. There are many categories of memories: primary and secondary memory. RAM, ROM, registers, accumulator, floppy, hard disk, CD-ROM, magnetic tapes etc are example of computer memory. The processing capacity of computer not only depends on processor, but also on capacity of primary memory.   The evolution of computer from one generation to next generation show variation in the processing speed, storing capacity, reliability, power consumption, and size. A memory system can be logically divided...

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CPU Registers

CPU Registers

In computer architecture, a processor register is a very fast computer memory used to speed the execution of computer programs by providing quick access to commonly used values-typically, the values being in the midst of a calculation at a given point in time. These registers are the top of the memory hierarchy, and are the fastest way for the system to manipulate data. In a very simple microprocessor, it consists of a single memory location, usually called an accumulator. Registers are built from fast multi-ported memory cell. They must be...

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Computer System

Computer System

The computer is designed to manipulate all types of data in the form of information. It is an electronic device in which data and control flow through bus in the form of digital pulse. It has mainly two parts: CPU and Pheripherals.     (a) CPU (microprocessor): The Central Processing Unit of computer is called CPU. It is a brain of computer and its main components are: main memory, ALU and control unit. In 1972, Intel introduced 200KHZ 8008 chip, the first commercial 8-bit microprocessor. It accesses 16 KB of memory. The speed of...

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Computer Architecture

Computer Architecture

The first microprocessor chip was invented by Dr. Ted Hoff of Intel Corporation (USA) in 1969 and it become commercially available in 1971. It is a chief component of computer, without microprocessor computer is not computer but only pile of electromechanical, electronic and plastic materials beautifully connected to each other. The working mechanism of computer is not simple, it is a complex machine so, it’s working mechanism is also very complex for new comers. Here, only summery of working mechanism is presented in simple words: Main...

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