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Compare and Contrast Microsoft DOS with UNIXAs is suggestive of its name an operating system OS is a collection of programs that operate the personal computer PC Its primary purpose is to support programs that actually do the work one is interested in and to allow competing programs to share the resources of the computer However the OS also controls the inner workings of the computer acting as a traffic manager which controls the flow of data through the system and initiates the starting and stopping processes and as a means through which software can access the hardware and system software In addition it provides routines for device control provides for the management scheduling and interaction of tasks and maintains system integrity It also provides a facility called the user interface which issues commands to the system software Utilities are provided for managing files and documents created by users development of programs and software communicating between users with other computer systems and managing user requirements for programs storage space and priority There are a number of different types of operating systems with varying degrees of complexity A system such as DOS can be relatively simple and minimalistic while others like UNIX can be somewhat more complicated Some systems run only a single process at a time DOS while other systems run multiple processes at once UNIX In reality it is not possible for a single processor to run multiple processes simultaneously The processor of the computer runs one process for a short period of time then is switched to the next process and so on As the processor executes millions of instructions per second this gives the appearance of many processes running at once User programs are usually stored on a hard disk and need to be loaded into memory before being executed This presents the need for memory management as the memory of the computer would need to
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