Originally, BIOS firmware was stored in a ROM chip on the PC motherboard. In modern computer systems, the BIOS contents are stored on flash memory so it can be rewritten without removing the chip from the motherboard.

Where is the BIOS chip located on a motherboard?

It’s usually located a the bottom of the board, next to the CR2032 battery, PCI Express slots or under the chipset.

Where is CMOS stored?

The CMOS configuration information is stored in a type of RAM called CMOS RAM. CMOS RAM is a special, volatile RAM chip that stores the CMOS information.