MCT260-Operating Systems I Operating Systems I Introduction to Operating Systems

MCT260-Operating Systems I 2 Primary Learning Objective Understand the functions, terminology, and evolution of operating systems (OS)

MCT260-Operating Systems I 3 Specific Learning Objectives Describe the interface between a user and the computer, application software and the OS the hardware and the OS Recognize how an operating system manages the basic processes within a computer Identify and define operating system key terms

MCT260-Operating Systems I 4 Lesson Overview What are the basic functions of an operating system? What do operating systems have in common?

MCT260-Operating Systems I 5 What is a Computer? Webster says that it is an electronic device designed to accept data, perform prescribed mathematical and logical operation at a high speed, and display the results of these operations. Where could we get another definition? ter.htmlhttp:// ter.html

MCT260-Operating Systems I 6 Main Components of a Computer Input devices Output devices Central Processing Unit (CPU) Memory (primary storage) Mass storage device (secondary storage)

MCT260-Operating Systems I 7 Why Have an OS? There are many types of computers intended for various purposes. Therefore, they operate in different ways. The operating system dictates what the computer can do and how the computer does it.

MCT260-Operating Systems I 8 What is an OS? An operating system is a computer program that manages the basic tasks within a computer, coordinates the interaction of hardware and software so all components will work together, and provides support for the use of other types of software such as application software and utilities.

MCT260-Operating Systems I 9 Loading the Operating System Booting refers to the process of powering on a computer and loading the OS. The startup programs are stored on the ROM BIOS chip. The Power On Self Test (POST) makes sure the computer contains the necessary components and that they are functional. The last step is locating and loading the OS into RAM.

MCT260-Operating Systems I 10 Commonalties of Operating Systems All operating systems provides an interface between hardware and applications user and applications user and hardware They all contain a set of basic programming instructions that translates requests from applications into commands that the hardware can understand and perform (machine language).

MCT260-Operating Systems I 11 Basic Tasks of Operating Systems Configures itself by loading additional software known as device drivers that manage a specific type of hardware component. Customizes the computer with optional software such antivirus software before the end of the boot process Displays a user interface –Graphical User Interface (GUI) –Command Line Interface (CLI)

MCT260-Operating Systems I 12 Basic Tasks of Operating Systems Provide support services to applications –starting and supervising application software programs –allocating memory to those programs –manages data storage Provide basic input/output (I/O) support

MCT260-Operating Systems I 13 Manage the file system –Provide a file-organization system to keep track of files on a disk –Provide a set of disk management tools that enable the user to move, copy, erase, create, and view files and directories (folders) –Provide a way for the user to load and execute programs Manage system resources such memory or RAM Basic Tasks of Operating Systems

MCT260-Operating Systems I 14 Basic Tasks of Operating Systems Resolve system error or problems Provides help Provides a means of optimizing the systems performance Provides a variety of tools for troubleshooting Later OS’s provided support for communications with other computers

MCT260-Operating Systems I 15 How OS Accomplishes Tasks Through software –Windows based OS’s uses the Control Panel and ‘Plug and Play’ to setup device drivers –DOS uses system level files (config.sys and autoexec.bat) to configure device drivers Through hardware using controllers and adapter boards

MCT260-Operating Systems I 16 Software Hardware Applications Operating System Mouse Keyboard Monitor Printer Disk Controllers Modem NIC

MCT260-Operating Systems I 17 Identify and Define Key Terms device, device driver, application software, system software, graphical user interface, command line, boot, bootstrap, RAM, ROM, BIOS, CPU, command prompt, internal commands, external commands

MCT260-Operating Systems I 18 Review An operating system is a program that acts as an intermediary between a user and a computer and the computer hardware. The purpose of an OS is to provide an environment in which the user can execute programs in a convenient and efficient manner. The primary goal of an OS is to make the computer system convenient to use. The secondary goal is to use the computer hardware in an efficient manner.

MCT260-Operating Systems I 19 References –Choose Operating Systems or MS_DOS –Next choose the Notes link Use a search engine to find a different source

MCT260-Operating Systems I 20 Homework Assignment Reading: Windows XP Textbook – Chap 1 CLI Textbook - pp.3-20 References: Internet Lab Exercise: Functions of an OS Homework: OS Types and Terms Due Date: In One Week from Today Bring a floppy disk to the next class