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  • 1. By: Molly Lepine and Stacey Raap
    IT 101
    Operating Systems

2. What is an Operating System????
An Operating System (OS) is set of computer programs that runs or controls the computer hardware
Operating 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 systems
They help most digital devices operate
Every computer is controlled by an OS, usually find software stored on a disk
4. What do OS do????
Control computer hardware
Manage memory
Manage processors
Control input and output devices
5. What do OS Do???? (cont.)
Store and manipulation files
Prove a user interface
Most today provide networking features
Some support larger computer systems
6. Specifications of OS
Designed to work with specific types of computers and processors
Application software works specifically with a particular operating system
7. Interactions
Provides a user interface that allows you to interact with the system
User Interface: What defines the users experience and causes some users to prefer Windows or MACs
8. Organization
OS provide structure for organizing data on the system
Data is stored in files which are put in folders and sub folders
9. Communication
Communicates with hundreds of external devices which are peripheral devices- through device drivers
Device Driver
Software that is installed for each device connected to a PC that allows the OS to communicate with that device
10. OS Control
Controls processing and memory use
How?
Retrieve instructions from the running software, decode it, sends it to CPU for execution, which then stores any data
Multitask by running multiple tasks at the same time
11. Input Control
Input: receives input from keyboard, mouse, touch screen, or any other input device
12. Output Control
Output: returns the results of processing to the display, printer, speakers, or other output device
13. Purposes of Input/Output Control Systems
Identify required IOCS services
Create control blocks for individual files
Process files
14. Identified Required IOCS Services
Supports several classes of I/O equipment
Disk drives
Tape drives
Unit record equipment
15. Create Control Blocks for Files
Create codes to block specific files
Each code is generated by a statement
Example of statements: DDF, DUF, CONSFILE
16. Process Files
They specify the actions that the system wishes to perform
This is done with processing macros
17. Types of Operating Systems
Embedded Operating Systems
A system that is hardwired into a computer component, such as a ROM or flash memory, to control a special purpose computer
Industrial Operating Systems
A system that controls large networked systems and servers
4 specific types of OSs for a computer
18. Embedded Operating Systems
Used in many special purpose computers
Typically are designed to perform a relatively limited number of task
Example: GPS
Optimized more easily which increases reliability and performance and reduces size and cost
19. Industrial Operating Systems
Much more complex manner than PCs- require OS that can manage multiple processors
Sometimes hundreds or thousands of processors, and many users
20. Thank you!Any Questions?