1. TYPES OF OPERATING SYSTEMS AMBARIN S.A BASEER 317079

2. WHAT IS AN OPERATING SYSTEM? An operating system (OS) is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system. A user cannot run an application program on the computer without an operating system.

3. PREVIOUS VERSIONS OF OS : REAL TIME MULTI-TASKING Vs SINGLE TASKING DISTRIBUTED EMBEDDED

4. MODERN OS TYPES : UNIX AND UNIX-LIKE OPERATING SYSTEMS AMIGA OS MICROSOFT WINDOWS

5. UNIX : Ken Thompson wrote Unix, based on his experience in the MULTICS project. B was replaced by C, and Unix developed into a large, complex family of inter-related operating systems which have been influential in every modern operating system. Ken ThompsonMULTICSC The Unix-like family is a diverse group of operating systems, with several major sub- categories including System V, BSD, and GNU/Linux.

6. AMIGA OS: Amiga OS is the default native operating system of the Amiga personal computer. It was developed first by the Amiga Corporation then sold to Commodore International, and initially introduced in 1985. Amiga Corporation AmigaOS can be divided into two parts: the Kickstart (ROM) and Workbench disks. Kickstart is the bootstrap ROM. The Kickstart contains the code needed to boot standard Amiga hardware and many of the core components of Amiga OS. Workbench is the native graphical desktop environment for the Amiga computer. Workbench is not the operating system, it's just a desktop environment running on top of Amiga OS

7. MICROSOFT WINDOWS : Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20. The most recent client version of Windows is Windows 7.

8. REAL TIME : A real-time operating system is a multitasking operating system that aims at executing real- time applications. Real-time operating systems often use specialized scheduling algorithms so that they can achieve a deterministic nature of behavior. The main objective of real-time operating systems is their quick and predictable response to events

9. MULTI TASKING Vs SINGLE TASKING : When only a single program is allowed to run at a time, the system is grouped under a single-tasking system. when the operating system allows the execution of multiple tasks at one time, it is classified as a multi- tasking operating system. Multi-tasking can be of two types: pre-emptive or co- operative. In pre-emptive multitasking, the operating system slices the CPU time and dedicates one slot to each of the programs. Unix-like operating systems such as Solaris and Linux support pre-emptive multitasking.

10. DISTRIBUTED : A distributed operating system manages a group of independent computers and makes them appear to be a single computer. The development of networked computers that could be linked and communicate with each other gave rise to distributed computing. Distributed computations are carried out on more than one machine.

11. EMBEDDED : Embedded operating systems are designed to be used in embedded computer systems. They are designed to operate on small machines like PDAs with less autonomy. They are able to operate with a limited number of resources. They are very compact and extremely efficient by design. Windows CE and Minix 3 are some examples of embedded operating systems.

12. COMPONENTS: The components of an operating system all exist in order to make the different parts of a computer work together.