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The system unit is the main part of a computer that houses the central processing unit (CPU), memory, and other important components. The system unit is usually the box-shaped unit that sits on or underneath a desk.
The BIOS is responsible for booting the computer. It loads the operating system and other necessary files. The BIOS also contains a set of instructions that the computer uses to perform basic tasks.
Cache memory is a type of memory that is used to store frequently accessed data. When data is accessed from cache memory, it is typically faster than accessing data from main memory. This is because cache memory is typically located closer to the processor than main memory.