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OPERATING SYSTEM BASICS
Operating System
- An operating system is a type of system software that acts as the master controller for all activities that take place within a computer system
FOUR COMPONENTS OF A COMPUTER SYSTEM
EXAMPLES OF OPERATING SYSTEM
WINDOWS OS
MAC OS
LINUX OS
user
APPLICATION
SOFTWARE
OPERATING
SYSTEM
HARDWARE
Operating System Activities
Operating System Activities
- Multitasking provides process and memory management services that allow two or more tasks, jobs, or programs to run simultaneously
- Within a single program, multithreading allows multiple parts, or threads, to run simultaneously
- An operating system’s multiprocessing capability supports a division of labor among all the processing units
Operating System Categories
- Single-user operating system
- Multiuser operating system
- Server operating system
- Desktop operating system
- Your computer’s small bootstrap program is built int
o special ROM circuitry housed in the computer’s system unit
- “The one program running at all times on the computer” is the kernel. Everything else is either a system program (ships with the operating system) or an application program
COMPUTER STARTUP
- bootstrap program is loaded at power-up or reboot, Typically stored in ROM , generally known as firmware
- Initializates all aspects of system Loads operating system kernel and starts execution
The Boot Process
Today’s Operating Systems
- Microsoft Windows
- Mac OS
- UNIX and Linux
• DOS
- Handheld Operating Systems
Microsoft Windows
Mac OS
UNIX and Linux
- Several Web sites offer a Linux distribution , which is a package that contains the Linux kernel, system utilities, applications, and an installation routine
You can tell when you’re using
Mac OS by the Apple logo that
appears on the menu bar. The
Mac OS X interface includes all
the standard elements of a GUI,
Including icons, menus,
windows, and taskbars.
Handheld Operating Systems
