/Operating-Systems-From-Scratch-

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Operating-Systems-From-Scratch-

As part of COMP520 - Operating Systems coursework, I created a basic operating system from scratch.

Tools used :

  1. Oracle VM virtual box
  2. virtual hard drive image file OS.VDI

Steps for installing and implementation

Instructions on setting up the virtualbox image:

Step 1: Download VirtualBox for your computer

Go here: https://www.virtualbox.org/wiki/Downloads

Step 2: Copy the virtual hard drive image OS.VDI to your

computer. This is a very large image, over 4GB! Give yourself plenty of time and make sure you have the space. You can get it from this link: https://www.dropbox.com/sh/2swm5rj6y5q7qr0/AAC4ms7e4WQIVvG24 c9yD3w0a?dl=0

Step 3: Follow the instructions here to import the image into

virtualbox and make a new virtual machine: https://blogs.oracle.com/oswald/entry/importing_a_vdi_in_virtualbox In the options, select Linux as your operating system and Ubuntu 32 bit as your version.

Step 4:

Boot the virtual machine. The Ubuntu desktop should come up within about one to five minutes, depending on the speed of your computer. On the desktop you should see a set of folders labeled Project A, B, C, D, E, and F. You should also see a file simulator.jar, and at the top of the screen you should see a button to open the terminal.

Step 5:

Double click on simulator.jar. Press Boot Floppy A: If you see a screen come up after a minute or so with the message “It Works”, then you're ready to start the project.

Stages in Building the Operating System :

  1. Booting (Project_A)(https://github.com/rohith28/Operating-Systems-From-Scratch-/tree/master/ProjectA)
  2. System Calls (Project_B) (https://github.com/rohith28/Operating-Systems-From-Scratch-/tree/master/ProjectB)
  3. Loading Files and Executing programs (Project_C) (https://github.com/rohith28/Operating-Systems-From-Scratch-/tree/master/ProjectC)
  4. Writing Files and Improving the Shell (Project_D) (https://github.com/rohith28/Operating-Systems-From-Scratch-/tree/master/ProjectD)
  5. Processes and MultiTasking (Project_E) (https://github.com/rohith28/Operating-Systems-From-Scratch-/tree/master/ProjectE)