System unit/ Computer system: It is unit that connects all hardware of computer system inside system unit. System / computer system can be further divided into three sub-units. These are processor, Motherboard or system board and memory.
1) Processor: The processor or central processing unit (CPU) is the 'Brain' of the computer system. It supervises and processes all operations of computer system.
2) Motherboard: The motherboard is one the main components of computer system. All hardware devices are attached directly or indirectly with mobo. The motherboard allows various hardware components to transfer data/ information to each other.
3) Memory: Memory is used to store. There are tow types of primary memory.
RAM(Random Access Memory)
ROM(Read Only Memory)
a) Ram (random access memory): It is read only memory. Ram is known a volatile memory because and information stored into it is finished when computer is switched off.
b) Rom (read only memory): A read only memory is one in which information is stored permanently. When computer is switched off, the information inside the Rom is not lost and hence it is also called a non-volatile memory. Rom is fixed on motherboard of computer system.
Posted By: Wasim Javed
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