History of operating systems

1. OS development history 2. Simple systems 3. Multiprogram systems 4. Time division systems 5. File concept 6. Interactivity, Parallel systems 7. Symetric and asymetric 8. Distributed systems 9. Real time systems 10. Advantages & disadvantages

History of operating systems – first OS – CTSS – first graphic program – first graphic interface – UNIX – ALTO – MS-DOS – Windows 1.0

History of operating systems Simple systems - Single process - No interrupts - Batch files

History of operating systems Multiprogram systems - Need for interrupts - Batch files useless

History of operating systems Time division systems - Next step after multiprogram systems - Multitasking - Idea of files

History of operating systems File concept „A computer file is a block of arbitrary information, or resource for storing information, which is available to a computer program and is usually based on some kind of durable storage.” Wikipedia

History of operating systems Parallel systems - Higher reliability - Cheaper - Faster - Fault-tolerant

History of operating systems Symetric multiprocessing - Every processor has copy of OS - Procesors comunicate if need

History of operating systems And asymetric multiprocessing - One main processor - Easier - Less reliabile

History of operating systems Distributed systems - Sharing resources - Faster - Reliability

History of operating systems Real time systems - Hard real-time systems - Soft real-time system

History of operating systems Advantages - Faster - Easy in use

History of operating systems Disadvantages - More complex - Still too low reliability

History of operating systems Thank You