Hardware Secrets
Home | Camera | Case | CE | Cooling | CPU | Input | Memory | Mobile | Motherboard | Networking | Power | Storage | Video | Other
First Look
Gabriel’s Blog
Main Menu
About Us
Awarded Products
Manufacturer Finder
RSS Feed
Test Your Skills
Subscribe today!

Home » Dictionary » Motherboard

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Numeric

Author: Gabriel Torres Last Updated: June 30, 2005
Category: Motherboard

Complementary Metal Oxide Semiconductor

CMOS is a integrated circuit manufacturing technology. This technology can be subdivided in PMOS (if a P-type semiconductor is used, i.e. with positive charge) and in NMOS (if a N-type semiconductor is used, i.e. with negative charge). Many integrated circuits are manufactured using this technology.

In PC CMOS is synonym of configuration memory, because this memory is manufactured with this technology.

The configuration memory is used to store hardware configuration data such as hard disk type and boot sequence.

The configuration memory (or CMOS, as you wish) is a RAM memory, meaning that its contents are erased when its power is cut. In order to avoid that, CMOS it is fed by a battery, that also feeds the system real time clock (RTC).

The configuration memory contents can be altered using a software called setup, which can be called by hitting the Del key while the computer is counting memory when you turn it on.

Nowadays the configuration memory is embedded inside the motherboard chipset, in a circuit called south bridge.

South Bridge
click to enlarge
Example of a south bridge chip.

Related Terms:

Print Version | Send to Friend | Bookmark this Term

There are 369 terms in our database.

RSSLatest Content
A10-6800K vs. Core i3-4150 CPU Review
March 25, 2015 - 3:15 AM
Core i7-5960X CPU Review
February 24, 2015 - 3:00 AM
ASUS ZenFone 6 Smartphone Review
January 23, 2015 - 4:15 AM
WD My Cloud 3 TB Network HDD Review
January 19, 2015 - 4:30 AM
AMD Athlon 5150 CPU Review
January 12, 2015 - 5:30 AM
Pentium J2900 CPU Review
January 7, 2015 - 5:00 AM
ASRock Q2900M Motherboard
January 6, 2015 - 2:26 AM

2004-15 Clube do Hardware, all rights reserved.
Advertising | Legal Information | Privacy Policy
All times are Pacific Standard Time (PST, GMT -08:00)