1 / 13

D ISK O PERATING S YSTEM

D ISK O PERATING S YSTEM. Is a master program that coordinates the flow of information between the computer and the user. A command user interface (text based) Has the responsibility of integrating the various devices that makes up a computer system. MS DOS ENVIRONMENT.

nodin
Download Presentation

D ISK O PERATING S YSTEM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DISK OPERATING SYSTEM • Is a master program that coordinates the flow of information between the computer and the user. • A command user interface (text based) • Has the responsibility of integrating the various devices that makes up a computer system.

  2. MS DOS ENVIRONMENT C:\My Documents\Hello.txt> COMMAND PROMPT DRIVE PATH

  3. Responsibilities of DOS: • Coordinates the input and output devices • Enable user to load and execute programs • Maintain an orderly system of files on disk

  4. MS – DOS was known variously as : • Seattle Computer Products 86-DOS • IBM Personal Computer DOS • Zenith Z-DOS • - developed by Seattle Computer Products for its 8086-Based Computer

  5. QDOS 0.10 (Quick and Dirty Operating System) • first version of DOS in August 1980 • had all the basic utilities for assembly language except an editor EDLIN ( Editor of Lines) • A primitive line-oriented operating system July 1981 – Microsoft bought all the rights to DOS from Seattle Computer Products

  6. HISTORY OF MS- DOS

  7. BOOTING A COMPUTER The computer will go through a process of “booting” or “bootstrapping.” The term comes from the phrase “pulling yourself up by your own bootstraps.” With the power off, a computer is a dead hunk of steel, silicon and wires. During the booting process, it has to wake up, find all of its peripherals and configure itself o run software. Loading a computer follows a sequence to make all this happen.

  8. BOOTING A COMPUTER: 1. BIOS (Basic Input Output System) • A series of instructions contained in a ROM ( Read Only Memory) 2. POST ( Power On Self Test) • The very first thing that happened to boot sequence. It runs from the BIOS and allows the computer to check the memory, keyboard, disk drives, etc. 3. MBR (Master Boot Record) • When all the peripherals are working, the BIOS then looks for the appropriate disk for further instructions. Whether a floppy or hard disk, it contains the very first sector of a bootable disk (the boot sector) contains the MBR which contains the information on where to go next in the boot process.

  9. DOS BOOT SEQUENCE: 1. IO. SYS • Contains the interface between MS-DOS and the input/output subsystem. It allows the OS to communicate with the basic peripherals and perform input and output tasks. 2. MSDOS.SYS • Is the Kernel of the OS. It interacts with the hardware and help process the various DOS functions. 3. CONFIG.SYS • Contains the information that configures the system 4. AUTOEXEC.BAT • A batch file which means that it contains a series of commands that are executed whenever the file is run. “Automatically executed” when you boot.

  10. SUMMARY OF DOS BOOT SEQUENCE: • POST • MBR • IO.SYS • MSDOS.SYS • CONFIG.SYS • COMMAND.COM • AUTOEXEC.BAT • COMMAND PROMPT

More Related