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Word Count: 446
DOS Disk Operating System was developed by the Microsoft Corporation as the standard operating system for use with IBM personal computers It controls the basic functions of the computer and is especially handy for working with data stored on disks The DOS system resides on diskette 35 or 525 and the system files may be transferred to a hard disk unitAn operating system is a program that allows competing programs to share the resources of the computer memory disk and devices like printers and modems and processing time The operating systems first job is to initialize the hardware of the computer system before running application programs For personal computers MSDOS is a single user single tasking operating system Single user means only one person uses the computer at a time Single tasking means that it essentially only runs one application program at a time and has no inherent support for running more than one application program simultaneously An operating system provides mechanisms for running programs handling errors controlling devices configuring the computer system and for MSDOS a user interface sometimes called a shellThe main system part of MSDOS consists of three files IOSYS implements MSDOS as seen by the hardware It has default device drivers for console display and keyboardMSDOSSYS implements MSDOS as seen by application programs It supports character device input and outputCOMMANDCOM is the shell program that interprets user commands presents the shell prompt and contains a set of internal commands A diskette used to load MSDOS into the computer must contains these three files In addition these files must be first on the disketteThe rest of MSDOS consists of utility programs Examples of these are backup backup files to another disk format format a disk for use by MSDOS print print
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