The memory and the processor are are swapped and are started by sending the address of the memory location to be accessed to the memory unit and issuing the appropriate control signals. First instruction sends the contents of the memory location LOCA into processor Register R0, and meanwhile the second instruction adds the contents of Register R1 and R0 and places the output in the Register R1.The above mentioned example can be written as follows:.This instruction adds the operand at memory location LOCA to the operand which will be present in the Register R0.Data which is to be used as operands are moreover also stored in the memory.The memory brings the Individual instructions into the processor, which executes the specified operations.An appropriate program consisting of a list of instructions is stored in the memory so that the tasks can be started.Instructions take a vital role for the proper working of the computer.Output Unit :– It displays the processed result to outside world. Ex- Magnetic Disks, TapesĪll the arithmetic & Logical operations are performed by ALU and this operation are initiated once the operands are brought into the processor. It is used when large amount of data & programs are needed to store, particularly the information that we dont access very frequently. Primary memory is essential but expensive so we went for secondary memory which is quite cheaper. Random Access Memory are those memory in which location can be accessed in a shorter period of time after specifying the address. Programs should be stored in memory before getting executed. Primary Memory is quite fast which works at electronic speed. It stores programs as well as data and there are two types- Primary and Secondary Memory Whenever we press any key it is automatically being translated to corresponding binary code & transmitted over a cable to memory or proccessor. The most famous input device is keyboard.
A Computer has five functional independant units like Input Unit, Memory Unit, Arithmetic & Logic Unit, Output Unit, Control Unit.Ĭomputers take coded information via input unit.
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