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BIOS: An abbreviation for Basic Input/Output System. On PC-compatible systems, the BIOS is used to perform all necessary functions to properly initialize the system's hardware when power is first applied. The BIOS also controls the boot process, provides low-level input/output routines (hence its name) and (usually) allows the user to modify details of the system's hardware configuration. [Via redhat.com]
BIOS: The Basic Input/Output System in ROM that used by Intel-compatible computers to configure devices at system startup time. [Via apple.com]
BIOS: stands for Basic Input/Output System. It is a permanent part of your computer and stored in special Read-Only Memory chips. Consequently, the BIOS used to be called the ROM BIOS. It is a set of instructions that tell the microprocessor in your computer what to do. [Via sis.com]
BIOS: An acronym for basic input/output system, which is software (usually contained in ROM) that supports the transfer of information between system elements such as memory, disks, and the monitor. [Via microsoft.com]
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