Real-Time Clock, CMOS RAM, and Battery: Dell Dimension P133v, P166v, and P200v
Real-Time Clock, CMOS RAM, and Battery: Dell™ Dimension™ P133v,
P166v, and P200v
The integrated real-time clock (RTC) is DS1287- and
MC146818-compatible and provides a time-of-day clock and a
100-year calendar with alarm features. The RTC can be set via the
BIOS SETUP program. The RTC also supports 256-byte,
battery-backed CMOS RAM in 2 banks, which is reserved for BIOS
use. The CMOS RAM can be set to specific values or cleared to the
system default values using the BIOS SETUP program. Also, the
CMOS RAM values can be cleared to the system default values by
using a configuration switch on the system board. An external
coin-cell-style battery provides power to the RTC and CMOS
memory. The battery has an estimated lifetime of 7 years and is
socketed for easy replacement. When the system is on, power is
supplied from the power supply to extend the life of the battery.
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