OPERATING SYSTEMS BY LANDON, KYLE, AND ETHAN

WHAT IS THEIR PURPOSE? (1) manage the computer's resources, such as the central processing unit (2) establish a user interface (3) execute and provide services for applications software

HOW DO THEY WORK? When you press the power button on your computer what does it do? (Starts a program) Read only memory chip is where program is stored Start up BIOS which checks hardware and finds MBR Starts up master boot record (MBR) – enough code finish loading of a installed operating system Each OS has its own code Looks at partition table and starts VBR (Volume Boot Record) The VBR then runs the OS program code allowing it to run

TYPES OF OS (OPERATING SYSTEM) CPM OS 360 Unix Linux PC-DOS (MS-DOS) System 7 (Macintosh OS)

CPM Latest Release was version 3.1 in 1983 Built up of 3 different parts (BIOS, BDOS, and CCP) BIOS (Basic Input Output System) Checks Hardware BDOS (Basic Disc Operating System) allowed user to open files, output to a console, and printing CCP (Console Command Processor) allows access to the terminal by inputting information using the keyboard File names were specified as a string “data type” with only 8 characters

OS 360 This OS was introduced by IBM in 1964 The 360’s main purpose was to operate a series of widespread applications One of the first OS to require a direct access storage device Its name 360 was inspired since they wanted the OS to have the ability to support a full range of machines The OS 360 as an operating system was a failure however its hardware first rate and paved the way for more operating systems to come OS 360 was programmed in such a way that all of the information overlapped and caused errors The OS required more memory than planned, was over budget, and was slow

PC-DOS (MS-DOS) MS-DOS and PC-DOS were inspired by IBM’s PC (Personal Computer) When IBM come out with a Personal Computer they asked Microsoft to develop a OS for it Microsoft took this on and created PC-DOS which is a command line interface operating system for the ICM-PC These commands are entered on a command prompt MS-DOS like PC-DOS was created by Microsoft and was just an improved upon version of PC-DOS making it a command line interface as well

UNIX Operating system developed in 1960’s Unix does have a GUI similar to windows but not everything's covered by it Many different kinds Made up of three parts The Kernel is the hub ( allocates time and memory to programs, also it handles file storage and communications) The Shell( it’s the interface between the user and the kernel) Files/Processes(Everything in Unix is either a file or a process)

LINUX Linux created in 1990’s Gateway for open source free o/s Systems were intentionally like Unix

SYSTEM 7 (MACINTOSH OS) Introduced in 1991 by apple Codenamed “Big Bang” Multiple new features added with this system Virtual Memory Personal file sharing Quick time Quickdraw 3D Graphical User Interface

THE END TO THE BASIC OF OPERATING SYSTEMS