<P> For IBM PC compatible computers , BIOS ( / ˈbaɪɒs / BY - 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 run when powered on . 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 . The interface of that original system serves as a de facto standard . </P>
<P> For IBM PC compatible computers , BIOS ( / ˈbaɪɒs / BY - 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 run when powered on . 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 . The interface of that original system serves as a de facto standard . </P>
where is the basic input / output system ( bios ) stored
where is the basic input / output system ( bios ) stored
on a personal computer 's system board
on a personal computer 's system board