it is permanently stored on one or two ROM ICs installed on the system board
Cmos setup information are stored in ROM bios chip.and it was maintain by a 3.0 battery.its called cmos battery.
There is a non-volatile ROM chip built into the motherboard that stores and boots the BIOS on startup.
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In computing, BIOS (Basic Input Output System) is Chip on computer's motherboard, it is also called a firmware (software or machine code supplied by a company), when booting up computer BIOS prepare, identify and initialize system component hardware devices. This chip does behind the scene jobs and prepare PC to be ready to be used by users by loading Operating system.
BIOS - the Basic Input Output System of a computer, resides inside the computer's main enclosure on a small programmable chip on the "motherboard" (the central board to which all other computing components are attached). It usually is a black, rectangular chip, known as an EEPROM chip, which is, in effect "read-only" memory, but can be programmed with newer BIOS programming code by removing the BIOS chip and using special-purpose tools.
The BIOS code often is referred to as the computer's "bootstrap code," due to the fact that, in order for the computer to start up (boot), the BIOS chip must execute its own programming code to recognize all related computer peripherals and begin loading the operating system. Some typical BIOS designations/brands, which can be seen at boot-time (and often are stamped on the BIOS chip), are Phoenix BIOS, AMI BIOS and Award BIOS.
BIOS software is stored on a non-volatile ROM chip built into the system on the mother board.