CMOS: A small, battery-backed memory bank in a personal computer that holds configuration (BIOS) settings.
BIOS: A startup routine in a PC that enables users to reconfigure hardware settings that are stored in a small, battery-backed memory bank. Although today's BIOSs can detect new drives and update their settings automatically, older PCs required manual entering of disk parameters after a new drive was installed.
All BIOSs let you get to their settings at startup. Immediately after turning the machine on, a message is displayed that tells you which key to press (typically the DEL or F1 key). If there is no message on screen, refer to your system manual.
The BIOS setup has also been called the "CMOS setup" or the "CMOS RAM," because the settings are held in a tiny CMOS memory bank in the chip.
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