What is software:
—Programs that run on
computer are called software.
—A software consist of
set of instruction that are executed step by step.
—It is different from
hardware in that it cant be touched or seen.
—Hardware cannot work
without a software.
—Software give method
for communication between user and computer.
software
—All the processes of
computer i.e. input , output, processing, control and storage depends on the
software.
Types of Software:
—There are two types
of software
1.System software
2.Application software
.
System software:
—Control operations of
computer system
—coordinates the
activities and functions of hardware and programs.
—Control usage and
allocation of hardware components.
—E.g. how data will be
saved on hard disk, what will be priority of different programs running on
computer.
CPU:
—It consist of three parts
1.Control unit
2.Arithimatic Logic Unit (ALU)
3.chache
Control unit:
—It do all type of control functions for example coordination of all other parts, usage of RAM, controling ports input etc.
ALU:
—It is consist of two parts
1.Arithmetic unit
2.Logic unit
— arithmetic unit do all the mathimatical operations like addition and subtraction
—Logical unit do operation like AND OR NOT etc that involves some type of logic.
Cache:
—Cache is personal storage of CPU.
—When CPU is working on some data, it temporarily stores its result in the cache before it go to the output.
—Cache is fastest memory in computer but its size is very small, usually 3kb to 2 MB.
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