2.1.1 Overview Of Computer System Define computer systems.

A computer system is defined as combination of components designed to process data and store files. A computer system consists of four major hardware components; input devices, output devices, processor and storage devices. A computer system requires hardware, software and a user to fully function. State the meaning of input, process, output and storage.


Input is any data or instructions that we enter into the computer system for processing. There are four types of input: which are text, graphic, audio and video. Example of input devices are keyboard, light pen, joystick, microphone, mouse, video & digital camera.


The processing unit controls all activities within the system. The CPU is an example of a processor. It has the same important as the brain to human being.


Storage is a location which data, instruction and information are held for future use. It is the physical material that keeps keeps data, instruction and information. There are two types of storage. They are the primary storage and secondary storage. The example of storage devices are hardisk, Floppy Disk, diskette, RAM, CD ROM and DVD ROM.


Output is data that has been processed into a useful form, called information. There are four types of output, which are texts, graphics, audio and video. Example of output devices are monitor, printer, speaker and plotter. Describe the information processing cycle which includes input, process, output and storage.


Users input data or instruction into the computer system to be process. Input could be either text, graphic, audio or video. Input devices are used by users to input data. Input devices are any electronic device connected to a computer and produces input signals.


Data or instruction being input into the computer system is then processed by the CPU which controls all activities within the system. The results of the processed data are then sent to an output device as usable data.

A CPU interprets the and carries out the instructions by processing data and controlling the rest of the computer’s components.

A CPU consists of two subcomponents; the Control Unit (CU) and the Arithmetic Logic Unit (ALU). CU’s main function is to direct the CPU to process data by extracting instructions from memory and decodes and executes them. The CU manages a four-step basic operation which is called a machine cycle. The steps are Fetching, Decoding, Executing & Storing:


Computer storage is important to help users store programs and data to be used at a later time.

It is also useful to keep current data while being processed by the processor until the information is saved in a storage media such as a hard disk or a diskette. Computer storage also stores instructions from a computer program. There are two type of computer storage; primary storage and secondary storage.


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