2. The storage holds databases, files and programs. The output devices present the processed data as useful information products for the user.
- Input is any data or instructions that we enter into the computer system for processing.
• typing on a keyboard
• pointing with a mouse
- CPU accepts instruction from the user and translates the instruction into readable information (decode).
- The processing unit controls all activities within the system. For every instruction, the control unit repeats a set of four basic operations called the machine cycle:
- Storage is a location which data, instruction and information are held for future use. Every computer uses storage to hold system software and application software.
- When we issue a command to start the application software, the operating system locates the program in storage and loads it into memory.
- A storage medium, also called secondary storage is the physical material in the computer that keeps data, instruction and information.
- 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.
- The text consists of characters that are used to create texts, sentences and paragraphs.
- Graphics are digital representations of non text information such as drawings, charts and photographs.
- Audio is music, speech or any other sound. Video consists of images that provide the appearance of full motion.