DIGITAL COMPUTER

A digital computer is an electronic device that takes data and instructions as input from user, process it and provides useful information as output to the user.

BASIC CONCEPTS:

Bit
Nibble
Byte
1s complement of a binary number
2s complement of a binary number
Opcodes & Operands

FUNCTIONAL UNITS OF A COMPUTER:
A computer has 5 functionally independent main parts:
Input Unit
Memory Unit
Arithmetic and logic Unit
Output Unit
Control Unit

FUNCTIONAL UNITS OF A COMPUTER:
Input Unit : Computers accept coded information
through input units, which read the data.
Memory Unit : The function of the memory unit is to
store programs and data. There are 2 classes of
storage: Primary & Secondary
Arithmetic and logic Unit : All the arithmetic or logic
operations, are initiated by bringing the required
operands into the processor, where the operation is
performed by the ALU.

Output Unit : Its function is to send processed result to
the outside world. Example:- Printer
Control Unit : The Control Unit is used to co-ordinate
the operations of memory, ALU, input and output
units. The Control Unit can be said as the nerve center
that sends control signals to other units and senses
their states.

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