2. BABCA Software

3. Operating Systems (OS) aka Systems Software A set of instructions that coordinate all the activities among computer hardware resources Controls the operations of the computer and its devices

4. Operating Systems (OS) aka Systems Software Cont Functions performed include: –Systems start up –Opening, running and executing applications –Storing, retrieving, and copying files –Formatting disk Serves as the interface between the user, the application software, and the computer

5. Features of OS Usually stored on hard drive in “kernel” –Manages memory, files, and devices –Maintains clock –Assigns resource usage Memory resident –Placed in RAM each time the computer is turned on

6. Supports one to thousands of users –Single user: only one user at a time Stand alone PC Multitasking – allows use of more than one application at the same time –Multi-user allows two or more people to use a program at the same time –Multi-processing: supports two or more CPU’s at the same time Features of OS Cont

7. Memory management –Optimizes use of RAM –Uses buffers – temp storage while awaiting transfer from input to output –Virtual Memory (VM) – optimizes use of RAM by adding additional space from hard drive Features of OS Cont

8. Spooling print jobs –Data sent to printer faster than it can print –Temporarily stored until print finished –Ques numerous print jobs Configuring devices Monitoring system performance Administering security Manages storage and files Features of OS Cont

9. User Interface Interacts with user –Controls how data and instructions are entered and information is presented Two Types –Command-line: uses key words or special keys –Graphical User Interface (GUI) icon (picture) or buttons User friendly

10. Application Software Programs designed to perform specific tasks for users : –Productivity tool –Graphics/multimedia –Household activities –Business activities –Education –Pleasure –Communication

11. Categories of Application SW

12. Starting SW Applications

13. Dialog Box Special window displayed by a program to provide information, present available options, or request a response

14. Productivity Software

15. Word Processing

16. Word Processing Cont