An operating system (OS) controls computer hardware, manages memory and processors, and provides an interface between users and applications. OSes control input/output devices, store and manipulate files, provide networking features, and allow multitasking of multiple programs. Different OSes are designed for specific computer types and applications must be compatible with a particular OS. The OS organizes data storage and allows interaction through a user interface. It communicates with external devices through drivers and controls processing, memory usage, input, and output. Embedded OSes control specialized devices while industrial OSes manage large server systems.

1. By: Molly Lepine and Stacey RaapIT 101Operating Systems

2. What is an Operating System????An Operating System (OS) is set of computer programs that runs or controls the computer hardwareOperating Systems also act as an interface with both application programs and users

3. Why do we need OS????Operating Systems play a central role in the functioning of all computer systemsThey help most digital devices operateEvery computer is controlled by an OS, usually find software stored on a disk

4. What do OS do????Control computer hardwareManage memoryManage processorsControl input and output devices

5. What do OS Do???? (cont.) Store and manipulation filesProve a user interfaceMost today provide networking featuresSome support larger computer systems

6. Specifications of OSDesigned to work with specific types of computers and processorsApplication software works specifically with a particular operating system

7. InteractionsProvides a user interface that allows you to interact with the systemUser Interface: What defines the users experience and causes some users to prefer Windows or MAC’s

8. OrganizationOS provide structure for organizing data on the systemData is stored in files which are put in folders and sub folders

9. CommunicationCommunicates with hundreds of external devices – which are peripheral devices- through device driversDevice DriverSoftware that is installed for each device connected to a PC that allows the OS to communicate with that device

10. OS ControlControls processing and memory useHow?Retrieve instructions from the running software, decode it, sends it to CPU for execution, which then stores any dataMultitask by running multiple tasks at the same time

11. Input ControlInput: receives input from keyboard, mouse, touch screen, or any other input device

12. Output ControlOutput: returns the results of processing to the display, printer, speakers, or other output device

13. Purposes of Input/Output Control SystemsIdentify required IOCS servicesCreate control blocks for individual filesProcess files

14. Identified Required IOCS ServicesSupports several classes of I/O equipment Disk drivesTape drivesUnit record equipment

15. Create Control Blocks for FilesCreate codes to block specific filesEach code is generated by a statementExample of statements: DDF, DUF, CONSFILE

16. Process Files They specify the actions that the system wishes to performThis is done with processing macros

17. Types of Operating Systems Embedded Operating SystemsA system that is hardwired into a computer component, such as a ROM or flash memory, to control a special purpose computerIndustrial Operating SystemsA system that controls large networked systems and servers 4 specific types of OS’s for a computer

18. Embedded Operating SystemsUsed in many special purpose computers Typically are designed to perform a relatively limited number of taskExample: GPSOptimized more easily which increases reliability and performance and reduces size and cost

19. Industrial Operating Systems Much more complex manner than PC’s- require OS that can manage multiple processors Sometimes hundreds or thousands of processors, and many users

20. Thank you!Any Questions?