Types of O/S

Types of O/S

1. single user

   • Palm Os MS DOS UNIX

2. Single User - Multi- task

   • - Used mostly in desktops & Laptops. Eg: MAC OS MS Window Linux

3. Multi-User

   • -Make sure requirements of all users balance - sort each of the program has sufficient & separate resources Eg: Unix VMS MVS

4. Real Time (RTOS)

   • manage resources so a task executes in precisely same time, every time it occur. - control machinery, scientific instruments, industrial systems .
     • very little user interface capacity - no end user utilities - artificial intelligence O/S - 'Sealed Box when delieved.

5. Multi-threading

   • flow of execution through the process code, with its own program counter, system register and stack
     • light weight process improved performance need a multi-threading processor high capacity Ms Windows