The BIOS maintains a reserved block of program RAM at addresses 0x00400–0x004FF with different parameters initialized during the publish. All memory at and over tackle 0x00500 can be used with the boot method; it could even overwrite by itself.[23][24]
Boot procedure following the option ROM scan is finished and all detected ROM modules with legitimate checksums have already been known as, or quickly following write-up within a BIOS Model that does not scan for option ROMs, the BIOS calls INT 19h to begin boot processing.
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Calling genuine method BIOS products and services directly is inefficient for protected method (and prolonged manner) working methods. BIOS interrupt phone calls are certainly not used by fashionable multitasking working programs when they in the beginning load.
CIH specific the then-prevalent Intel i430TX motherboard chipset and took benefit of The reality that the Home windows 9x functioning devices, also common at enough time, authorized immediate components access to all applications.
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due to the fact this is blended up many instances in publications and in some cases in unique Microsoft reference documents, this text takes advantage of the check here offset-dependent byte-wise on-disk illustration to stay away from any feasible misinterpretation.
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The IBM PCjr is unique between PCs in possessing two ROM cartridge slots over the front. Cartridges in these slots map to the same location on the higher memory spot employed for choice ROMs, along with the cartridges can incorporate alternative ROM modules the BIOS would figure out. The cartridges could also have other kinds of ROM modules, like simple programs, which can be dealt with in another way. one particular PCjr cartridge can include a number of ROM modules of differing types, probably stored jointly in a single ROM chip.
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When a bootable machine is identified, the BIOS transfers Regulate towards the loaded sector. The BIOS would not interpret the contents of your boot sector besides to potentially look for the boot sector signature in the final two bytes.
New requirements grafted on to the BIOS are usually without the need of total public documentation or any BIOS listings. Subsequently, It's not as straightforward to master the personal aspects with regard to the a lot of non-IBM additions to BIOS as with regard to the core BIOS products and services.