What do you mean by functional units of a computer? Describe all units in detail with suitable examples and their functions.
Answers
Explanation:
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Explanation:
Computer types
A computer can be defined as a fast electronic calculating machine that accepts the (data) digitized input information process it as per the list of internally stored instructions and produces the resulting information. List of instructions are called programs and internal storage is called computer memory.
The different types of computers are:
Personal computers: This is the most common type found in homes, schools, business offices, etc. It is the most common type of desktop computers with processing and storage units along with various in put and out put devices.
Notebook computers: These are compact and portable versions of PC.
Work stations: These have high resolution input/output (I/O) graphics capability, but with same dimensions as that of desktop computer. These are used in engineering applications of interactive design work.
Enterprise systems: These are used for business data processing in medium to large corporations that require much more computing power and storage
capacity than work stations. Internet associated with servers have become a dominant worldwide source of all types of information.
Super computers: These are used for large scale numerical calculations required in the applications like weather forecasting etc.
1.2 Functional unit
A computer consists of five functionally independent main parts input, memory, arithmetic logic unit (ALU), output and control unit.
EIT Stock Image
Fig A: Functional units of computer
Input device accepts the coded information as source program i.e. high level language. This is either stored in the memory or immediately used by the processor to perform the desired operations. The program stored in the memory determines the processing steps. Basically the computer converts one source program to an object program. i.e. into machine language. Finally the results are sent to the outside world through output device. All of these actions are coordinated by the control unit.
Input unit: The source program/high level language program/coded information/simple data is fed to a computer through input devices; keyboard is a most common type. Whenever a key is pressed, one corresponding word or number is translated into its equivalent binary code over a cable and fed either to memory or process. Joysticks, trackballs, mouse, and scanners are other input devices.
Memory unit: Its function into store programs and data.
It is basically to two types
1.Primary memory
2.Secondary memory