What is CMOS?

Windows Vista Installation and maintenance tutorials
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Complementary metal-oxide semiconductor, or CMOS, typically refers to a battery-powered memory chip in your computer that stores startup information. Your computer's basic input/output system (BIOS) uses this information when starting your computer.
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BIOS: frequently asked questions
Here are answers to some common questions about BIOS. what is BIOS? Do I need to do anything with BIOS? What kind of BIOS does my computer have? How do CMOS and ACPI relate to BIOS? How do I access my computer's BIOS? How do I update BIOS?
 
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