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Beitrag: <blockquote data-quote="HATHOR" data-source="post: 225261">AW: Hat das Acer Aspire 5520 keine BIOS Batterie?...the contents of this four-sector flash ROM:Some of the types of information typically stored in flash ROM include: (1) boot code; (2) Ediag information; (3) the main BIOS; and (4) EISA configuration information. In general, the boot code can be program code for system initialization, such as that needed to boot the central processing unit ("CPU"), which controls the operation of the PC system. Boot code typically requires minimal or the least amount of updating. Because the boot code essentially initiates operation of the PC system, it is important that the contents of the boot code not be altered accidently when reprogramming the flash ROM. The Ediag information comprises diagnostic instructions enabling the CPU  to perform self-diagnosis routines to detect system errors. As such, some or all of the contents of the Ediag code may be changed periodically. The main BIOS includes the application  or program code itself, and may include data as well. The BIOS also may be reprogrammed periodically.</blockquote>