The Ultimate Guide To Bios
The Ultimate Guide To Bios
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The BIOS maintains a reserved block of program RAM at addresses 0x00400–0x004FF with a variety of parameters initialized throughout the POST. All memory at and earlier mentioned address 0x00500 may be used via the boot plan; it could even overwrite by itself.[23][24]
the 2nd BIOS virus was CIH, also called the "Chernobyl Virus", which was capable to erase flash ROM BIOS content material on suitable chipsets. CIH appeared in mid-1998 and became Energetic in April 1999. usually, infected pcs could no longer boot, and folks experienced to get rid of the flash ROM IC in the motherboard and reprogram it.
modern-day programs aren't prone to CIH because of various chipsets being used which happen to be incompatible With all the Intel i430TX chipset, and in addition other flash ROM IC types. There is certainly also excess defense from accidental BIOS rewrites in the form of boot blocks that happen to be shielded from accidental overwrite or twin and quad BIOS equipped units which can, within the occasion of a crash, utilize a backup BIOS.
contacting actual manner BIOS products and services instantly is inefficient for safeguarded method (and very long manner) working methods. BIOS interrupt calls will not be employed by modern multitasking working techniques when they to begin with load.
following the motherboard BIOS completes its publish, most BIOS variations try to find option ROM modules, also called BIOS extension ROMs, and execute them. The motherboard BIOS scans for extension ROMs in the percentage of the "higher memory place" (the A part of the x86 actual-method tackle Room at and over deal with 0xA0000) and runs each ROM identified, to be able. to find memory-mapped selection ROMs, a BIOS implementation scans the true-method address Place from 0x0C0000 to 0x0F0000 on 2 KB (2,048 bytes) boundaries, hunting for a two-byte ROM signature: 0x55 accompanied by 0xAA.
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obtain Manage in early AT-course equipment was by a physical keylock swap (which wasn't not easy to defeat if the pc circumstance could be opened). anybody who could activate the computer could boot it.[citation required]
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