BIOS
hardwareBasic Input/Output System, firmware stored on a chip that initialises hardware during the boot process
Pronunciation
Correct
BYE-oss
/ˈbaɪɒs/
Pronounced as an acronym with two syllables: 'bye-oss'. This pronunciation is universal in computing and has been standard since the term was introduced with IBM PCs in 1981.
Source: en.wikipedia.org(community consensus)