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BIOS has several functions in a computer but its most important task is to load the operating system. BIOS provides the microprocessor its first instructions upon activating the computer. Some of the common tasks that the BIOS performs include:
• A power-on self-test (POST) for all of the different hardware components in the system to make sure everything is working properly. During this process, the BIOS checks a specific memory location (address) on the computer (0000:0472). Information on whether the computer is being started from an off position (cold boot) or from...
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A communication device is a peripherical used for communication between the computers and other devices. Modem is a popular communication device which is normally used for internet communication. Infra red, Bluetooth and LAN card are the examples of communication devices.
Examples of communicacion devices are:
• Modem: Modulator/demodulator
• ISDN Card
• DSL/ADSL Card
• Network Card (Ethernet card, LAN card):
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An input/output device is also known as storage device. These computer devices preserve information for retrieval. In other words, an storage device is capable of storing data. The term usually refers to mass storage devices, such as disk and tape drives.
There are two types of storage devices used in computers; a ‘primary storage’ device and a ’secondary storage’ device.
Primary storage device
A storage location that holds memory for short periods of times. For example, computer RAM is an example of a primary storage...
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An output device is any peripheral that is connected to a computer and used to transfer data out of the computer in the form of text, images, sounds or other media to a display screen, printer, loudspeaker, or storage device.
Examples of output devices are:
• Monitor
• Printer
• Sound card
• Speakers
• Video card
• Buzzers
• Loudspeakers
Electronic output devices can be mechanical, audio, or visual. Mechanical outputs include motors, solenoids, and other electromagnetic devices....
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BIOS is the acronym for Basic Input/Output System also known as Binary Input/Output System, Basic Integrated Operating System and occasionally Built In Operating System. The BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions. The BIOS is what starts the computer after you turn on the power to your computer.
The BIOS is typically placed in a ROM chip that comes with the computer (it is often called a ROM BIOS). This ensures that the BIOS will always be available and will...
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A computer system may consist of several devices. Every device has its own functionality. We need these devices to work properly with computer. We can divide these devices into following types.
Input devices: An input device is used to provide data to computer for processing or storing. There are different types of input devices. Keyboard, mouse, scanner, light pen and barcode reader and card reader are the examples. All input devices are connected with the CPU. Different signals are generated...
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