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.

an operating system. Somehow, it must load the operating system --- whatever variant that may be --- from some permanent storage device that is currently attached to the computer (e.g. a oppy disk, a hard disk, a USB dongle, etc.). As we will shortly discover, the pre-OS environment of your computer o ers little in

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