Writing a Simple Operating System | from Scratch

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IWriting a Simple Operating System from ScratchbyNick BlundellSchool of Computer Science, University of Birmingham,UKDraft: December 2, 2010Copyrightc 2009 2010 Nick BlundellContentsContentsii1 Introduction12 Computer Architecture and the Boot Boot Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , Boot Blocks, and the Magic Number . . . . . . . . . . . . . . . . Emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : A x86 CPU Emulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Usefulness of Hexadecimal Notation . . . . . . . . . . . . . . . . . .63 Boot Sector Programming (in 16-bit Real Mode) Sector Re-visited.

Chapter 1 Introduction We’ve all used an operating system (OS) before (e.g. Windows XP, Linux, etc.), and perhaps we have even written some programs to run on one; but what is an OS actually

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