CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 0Dh - RTCsee Real-Time Clock - STATUS REGISTER D (read only)

Bitfields for Real-Time ClockA battery-powered clock which continues to maintain its time even while the system is powered down.  On PCs, the real-time clock contains a small amount of battery-powered memory (set CMOS RAM). status register D:
Bit(s)	Description	(Table C0004)
 7	Valid RAM(Random Access Memory)	See also DRAM, SRAM. - 1 indicates battery power good, 0 if dead or disconnected.
 6-0	unused (0)