Nonvolatile BIOS memory refers to a small memory on PC motherboards that is used to store BIOS settings. It was traditionally called CMOS RAM because it used a volatile, low-power complementary metal-oxide-semiconductor (CMOS) SRAM (such as the Motorola MC146818 or similar) powered by a small battery when system power was off. The term remains in wide use but it has grown into a misnomer: nonvolatile storage in contemporary computers is often in EEPROM or flash memory (like the BIOS code itself); the remaining usage for the battery is then to keep the real-time clock (RTC) going. The typical NVRAM capacity is 512 bytes, which is generally sufficient for all BIOS settings. The CMOS RAM and the real-time clock have been integrated as a part of the southbridge chipset and it may not be a standalone chip on modern motherboards.
Read more about Nonvolatile BIOS Memory: CMOS Mismatch, CMOS Battery, Resetting The CMOS Settings
Famous quotes containing the word memory:
“Twenty or thirty years ago, in the army, we had a lot of obscure adventures, and years later we tell them at parties, and suddenly we realize that those two very difficult years of our lives have become lumped together into a few episodes that have lodged in our memory in a standardized form, and are always told in a standardized way, in the same words. But in fact that lump of memories has nothing whatsoever to do with our experience of those two years in the army and what it has made of us.”
—Václav Havel (b. 1936)