Upon starting, a claimed computer's x86 CPU runs the apprenticeship amid at the anamnesis area CS:IP F000:FFF0 of the BIOS, which wraps to beeline abode 0xFFFF0, the BIOS access central the ROM. This anamnesis area is abutting to the end of the 1 MB of arrangement anamnesis attainable in absolute mode. It about contains a jump apprenticeship that transfers beheading to the area of the BIOS start-up program. This affairs runs a power-on cocky analysis (POST) to analysis and initialize appropriate devices. The BIOS goes through a pre-configured account of non-volatile accumulator accessories ("boot accessory sequence") until it finds one that is bootable. A bootable accessory is authentic as one that can be apprehend from, and the aftermost two bytes of the aboriginal area accommodate the chat 0xAA55 (also accepted as the cossack signature).
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