Addresses are numbers that identify successive locations.
The number of bits in each word is called the word length.
The word length ranges from 16 to 64 bits.
There are 3 types of memory.They are
RAM(Random Access Memory)
Memory in which any location can be reached in short and fixed amount of time
after specifying its address is called RAM.
Time required to access 1 word is called Memory Access Time.
The small,fast,RAM units are called Cache. They are tightly coupled with
processor to achieve high performance.
The largest and the slowest unit is called the main memory.
Most computer operations are executed in ALU.
Consider a example,
Suppose 2 numbers located in memory are to be added. They are brought
into the processor and the actual addition is carried out by the ALU. The sum may then
be stored in the memory or retained in the processor for immediate use.
Access time to registers is faster than access time to the fastest cache unit in
1.4. Output Unit:
Its function is to send the processed results to the outside world. eg.Printer
Printers are capable of printing 10000 lines per minute but its speed is
comparatively slower than the processor.
1.5. Control Unit:
The operations of Input unit, output unit, ALU are co-ordinate by the
The control unit is the Nerve centre that sends control signals to other
units and senses their states.
Data transfers between the processor and the memory are also controlled
by the control unit through timing signals.
The operation of computers are,
The computer accepts information in the form of programs and
data through an input unit and stores it in the memory.