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Computer system initialization

Source: Internet
Author: User
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1. Power-on or reset the computer

2. In the Rom, the startup is stored in the fixed position FFFF: 0000.ProgramIn the system, CS is set to FFFF, IPIS set to 0000, pointing to the BIOS (Basic Input Output System) entry, the CPU will execute the BIOS startup process.

3. BIOS startup process: power-on self-check, check the hardware device and link, store the test data to the BIOS data area, and read the Boot Loader from the floppy disk or hard disk according to the preset settings, it is located in the 0-cylindrical 0-Magnetic Track 1-sector (MBR), this sector stores boot loader, the last word stores the System logo, if it is 0aa55, after the hardware detection is completed, the BIOS submits the control to the boot loader.

 

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