(The BIOS can look in hard drives, floppy drives, CD-ROM drives etc. If all the components are working, the BIOS starts searching for a drive that might have an operating system.The BIOS (Basic Input Output System – this is a program that comes with any mother board and it is placed in a chip on the mother board) checks all the computer components to make sure that they are all working.Here is what happens when you start your computer: In this article, I would explain the first part of building an operating system. You would also learn from this article how to read and write raw sectors from a disk. And also, I'm sure every one would like to have their own operating system. If you know how an operating system works, it will help you a lot in programming, especially for system programs like device drivers even for non-system-programming, it can help a lot.
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