Transcription of 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, 2010 Copyrightc 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 .. Real Mode .. , Hello? .. Registers .. it all Together.
Boot Process 2.1 The Boot Process Now, we begin our journey. When we reboot our computer, it must start up again, initially without any notion of 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
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