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The set of routines stored in read-only memory that enable a computer to start the operating system and to communicate with the various devices in the system, such as disk drives, keyboard, monitor, printer, and communications ports.
[b(asic) i(nput/)o(utput) s(ystem).]
(Computer Science) Basic Input Output System: the built-in software which controls the primary functions of a PC
computer firmware that directs many basic functions of the operating system.
[B(asic) I(nput)/O(utput) S(ystem)]