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System Unit Components

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FUNCTIONS OF SYSTEM UNIT COMPONENTS The case that contains electronic components of the computer used to process data is termed as System. The Processor, Memory, Adapter cards, Ports, Drive bays and Power supply are the common components inside the system unit. MOTHERBOARD It is the main circuit board of a computer. It contains connectors for attaching other hardware and boards. The motherboard contains the CPU, BIOS, memory, mass storage, serial and parallel ports, expansion slots and all controllers to control the peripheral devices like the monitor, mouse and disk drives. The motherboard connects to every part of the computer, directly or indirectly. All the chips in the motherboards are known as motherboard chips. The chipsets are an important motherboard component. It controls how the motherboard interacts with every other component in the system. PROCESSORS The processor is the main chip in the motherboard. It is known as the heart of the computer system. It process data and executes instructions stored in the memory. ...read more.


THE BIOS It is a collection of software on a ROM chip, it is also a part of the Operating System. It is the Basic Input Output System which determines what a computer can do without accessing programs from the disk. The Bios contains the codes to control the keyboard, the monitor, the disk drives, serial communication etc. As the BIOS is placed on the ROM it's not affected by power failure, making possible the computer to boot itself than from an external sources like a CD. The Bios checks the default hardware configuration with the configuration data hence stable the system. So Bios is considered as the most important diagnostic tool available. It handles the input output flow of the computer data. http://www.webopedia.com/TERM/B/BIOS.html Author: Jupitermedia Corporation, New York POWER SUPPLY The PSU or the Power Supply Unit is a box in the CPU with a fan and a lot of cables. Its main job is to supply power to various system components in the right type and needed voltage. It accepts the electricity from the mains and converts it from AC to DC. ...read more.


There are two kinds of ports- Parallel and Serial port. Peripherals are of 3 types- Input, Output & I/O device. * Input device are devices through which user inputs data to the processor. Key board is an input device used to input information, mouse is used to input commands. * Output device shows the results of the input data or the command. * Input/Output device are the storage devices like a Ram or ROM. SPECIALISED CARDS They are the devices placed on the slots of the motherboard and connected to the buses to carry data. These slots are of three colors- the black slots are ISA slots which is connected to the buses that carry data at slower rate, the white slots are known as PCI slots which connects to the buses and have faster data transfer rate. The grey ones are the AGP slots used for Video cards. This slots have data transfer speed as same as of the processor speed. Ref: BTEC National- Information Technology Practitioners Book 1 (2nd edition) Author: Heinemann Publications ?? ?? ?? ?? Unit 2 - Computer Systems Hardware Systems -1- ND Diploma IT Practitioners ...read more.

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