C.S. Computer system (system unit) (What is this?)

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The system unit is the computer. Powerful electronic circuitry that makes up the computer is housed inside the case. Most system unit consist of the computer case with a power supply, motherboards, processor, memory (ram), hard drive, floppy disk drive, CD-ROM drive, disk controller, input/output ports, video adapter, and sound board. The variation of the components inside the system unit is what makes one personal computer more powerful than another personal computer.