Transcription of Writing a Simple Operating System | from Scratch
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Writing a Simple Operating System | from Scratch
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 .. , World! .. , Addresses, and Labels .. X Marks the Spot .. 13 Question 1 .. Strings .. the Stack .. 17 Question 2 .. Structures .. 17 Question 3 .. Functions .. Files .. it all Together .. 21 Question 4 .. , Fetch me my Steth-o-scope .. 5 (Advanced) .. the Disk .. Memory Access Using Segments .. Disk Drives Work .. BIOS to Read the Disk.
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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