Disk Operating System (DOS)

        What is operating system

        

Operating system is a set of software program which provides an interface between the user and the computer system (hardware). In other words,it co -ordinates the flow of information from the computer to the user and vice-versa . As a  simple analog if the computer were an automobile the operating system is the driver ,so while the automobile is complete in itself as a piece of machinery ,it will not provide any function on its own ,the requires a driver.

An operating system also handles memory, CPU,disk ,I/O management and control the execution of application programs. The DOS integrates various devices that make up a computer system .It is  responsible for:

(I) Memory management :

                                                               Memory is a term always referred to RAM-  the main memory of your system . When your job are run , OS retrieves it form the disk and loads  it into its memory .But , before it is loaded, the OS must check whether memory is available for it  or not, and if available,it allocated it to your job .Once the execution of the job is over , the job should be renoved from memory and this freed memory is allocated to another job .

(II) CPU management:

                                                          It   is the arrangement  of the CPU that allow processes to accomplish job assigned to it .That assignment is a complex problem handle by the operating system. Os handle the problem of assigning various job for processing.  The function of the os is also called job scheduling.

(III) Disk management:

                                                           The OS helps you to store filed and retrieve files whenever, required by you. We ,as a user ,need not bother about how the data or files are stoned on a stored medium, where it is stored ,or where to look for it.

(IV) Input/Output management:

                                                                        The computer system that you are using might be attached to peripheral devices like keyboard,printer ,modem,mouse etc. Each one handling either the input or  output job of  your system. All these device communicate with the computer for getting the job and getting the job done , which is again monitored by OS.

(V) User Interface:

                                            There must be a way to interact with the system  form outside world because as you know that computer understand the language of 0's and 1's .The gap between the machine understandable language and human understandable language is bridged with help of OS's command -interpreter .

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