Every Computer that uses disks must have a master program that coordinates the flow of information from computer to disk. This is called the Disk Operating System or DOS.
MS-DOS: Acronym for Microsoft - Disk Operating System. It is a single tasking and single user operating system with a command line interface. MS-DOS released in 1981 when it was used on an IBM PC’s compatibles.
Software is the set of programmes for a specific purpose, and programme is set of instructions or commands to attain the solution of a particular Job.
An Operating System is a set of programs which access the system resources and present in a manner. Which the user can interrupted.
An Operating System consists of three basic Modules.
1) File Control System.
2) Process Control System.
3) I/O Control System.
File Control System:
It deals with the organization of data on the storage devices and accessing of the same.
Process Control System:
It deals with the execution of a program or instruction.
I/O Control System:
It deals with the Controlling of the I/O Operations with different peripherals of the system.
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