Chapter 2: Operating system

Applications of Operating system

• Supervisor mode, problem mode
• Operating system's needs

Using Operating system

• Batch processing
• Uni-programming
• Multiprogramming
• Real time processing (on-line processing)
• Time sharing

Interruption

• Reasons for interruption
• Interrupt handler

Division of memory in parts

• Static areas
• Dynamic areas
• Blocks, page frames
• Replacement of dynamic pages

Time sharing of Central Processing Unit

• Choosing a program
• Priority in interrupting a program
• Time sharing

Control and access to information and User interface