Input Output Unit

Output Units

Output Units

The major component of computer system is CPU, Input Unit and Output Unit. All the performances of computer revolve around these components. The output unit is used to present soft and hardcopy of information. The VDU (Visual Display Unit or Monitor) and printer are common output units. There are many categories of display units available for computer. The LED (Light Emitting Diode), LCD (Liquid Crystal Display), DVST (Direct View Storage Tube) etc are text and graphics display output devices. The size of screen is measured from one corner to...

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Extension slots and Ports

Extension slots and Ports

Extension slots expand the capabilities of computer. These are slots that allow new and enhanced feature to be added by you.   Expansion slots can be categorized into three different categories: ISA, PCI, and AGP. (i) ISA (International Standard Architecture): are the old slowpoke (16 bits) connectors. They have very low data transfer speeds and interrupt the processor frequently while transferring. They are problematic in install and use up scarce processor interrupt request lines. (ii) PCI (Peripheral Component Interconnector): PCI are...

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Input Units

Input Units

A computer consists of an I/O system. This system includes two basic components, one is I/ O device and other called I/O Module. A device which is connected to an I/O module of computer is called a peripheral. The data entry station or devices are termed as input units. Example: keyboard, mouse, scanner, joystick, joypad, graphics table, MICR etc.   (a) Keyboard: The keyboard is a standard input device. It is a data entry platform of computer. The layout of the keyboard is like that of traditional QWERTY typewriter, although some extra...

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