Chapter 1 : The computer system
It is important to know that Data + Structure=Information . A digital computer is a machine that can be programmed to accept data (input) and process it into information (output) . A computer is a device that accepts input processes data, stores data and produces output. Input is the process of entering the data into the computer while output processed data out of the computer.
Softcopy means that you can display your document on the screen while hardcopy means that the data was send to the printer and can see it on a paper.
Storage devices like Cd , pendrive, hard disk, floppy disk .. can hold data permanently so you can save and retrieve* it later. *Retrieve means data is fetched from the computer and read.
Hardware are all those units that can be seen and touched e.g monitor, keyboard.... . Software is another word for programs. Application software is the kind of software that people uses to make a document . System Software is the the software that the computer uses to manage its own internal activities and run application.
A bus is a data road way along which data and commands travel. There are three types of bus
- The address bus
- The data bus
- The contol bus
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