What is a BIOS? BIOS, pronounced "bye-ose," is an acronym that standsfor Basic Input Output System. The BIOS is built-in software that determineswhat a computer can do without accessing programs from a disk. On PCs, theBIOS contains all the code required to control the keyboard, display screen,disk drives, serial communications, and a number of miscellaneous functions.Furthermore, The BIOS is responsible for booting your PC by providing abasic set of instructions. The BIOS performs all the necessary tasks that needto be initiated at start-up time: POST(Power-On Self Test, booting anoperating system from FDD or HDD). In essence, it is necessary to upgradethe BIOS on your PC in order to maintain or inevitably obtain compatibilitywith the PC industries latest hardware, software and operating systems.