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The name originates from the Basic Input/Output System used in the CP/M operating system in 1975.
Originally proprietary to the IBM PC, the BIOS has been reverse engineered by companies looking to create compatible systems.
Imsai was subsequently licensed to distribute CP/M version 1.3 which eventually evolved into an operating system called IMDOS.
By this time, CP/M had been adapted for four different controllers. In 1976, Glenn Ewing approached me with a problem: Imsai, Incorporated, for whom Glenn consulted, had shipped a large number of disk subsystems with a promise that an operating system would follow.
I was somewhat reluctant to adapt CP/M to yet another controller, and thus the notion of a separated Basic I/O System (BIOS) evolved.
-oss; an acronym for Basic Input/Output System and also known as the System BIOS, ROM BIOS or PC BIOS) is non-volatile firmware used to perform hardware initialization during the booting process (power-on startup), and to provide runtime services for operating systems and programs.
The BIOS firmware comes pre-installed on a personal computer's system board, and it is the first software to run when powered on.