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A system unit is a case that contains electronic components of the computer used to process data.
The most common components are inside a system unit are:
The processor
The memory
Adapter cards e.g. sound card, modern card, video card, network card.
Ports
Drive bays
Power supply
More Information:
Motherboard: The main circuit board in system unit is called the motherboard, it contains adaptor cards processor and memory chips. The mother can also be called the system board.
Chip: A chip is a small semi-conducting material where intergrated circuits can be etched. Integrated circuits have many microscopic pathways capable of carrying electric current. Chips are packed in a certain way so they can be connected to a circiut board.
Central processing unit (CPU): The CPU carries and interprets basic instructions that can operate a computer. The control unit coordinates operations in a computer. The Arithmetic logic unit (ALU) does arithmetic, comparison and logical operations. This can also be known as the processor.
Machine cycle: The machine cycle is the name of the four operations of the CPU. The first step is to 'fetch' the program instuction/data from the memory. The second step is to 'decode', which means translate the instruction into instructions. Step three is to 'execute', carry out the instruction. Finally step four is to 'store', write the result back to memory.
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