CMOS - Complementary-metal-oxide-semiconductor | Why it require | How to repair it

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CMOS - Complementary-metal-oxide-semiconductor is a technology for constructing internal circuit. The CMOS refers to a battery. It is semiconductor memory where data is stored temporally. It consume less power and it also immutable.



What does the CMOS contain?

                            Presumably you are referring to the CMOS _memory_ - CMOS itself is simply a logic family used in most modern computer chips. Nowadays the name only really has historical meaning.

The CMOS memory stores the time, date, details of various peripherals connected to the system (hard and floppy drives, serial and parallel ports etc) and possibly the BIOS password if one is set. There are reasonably comprehensive details at http://bochs.sourceforge.net/techspec/CM... but that is something for the techies and not one for the average computer user.

CMOS is the memory which contains the settings necessary for the BIOS to get your system to start up. It holds your boot preferences, memory settings, date, time, etc. CMOS is volatile memory and your computer has a little battery inside that keeps these settings when the computer is unplugged.

 To keep all the BIOS settings we need a storage area and it is not hard disk. We need to store all this settings information on the motherboard  itself and it can work without the help of storage devices. So, for this purpose all the BIOS setting are stored inside the CMOS.

                The CMOS is a 64 or 128 byte RAM memory. That is we can change the content of the CMOS. For example, when your entering into BIOS setting and doing some change, actually your changing the content of CMOS not BIOS.

General Problems related to CMOS on your PC

                                        When a CMOS on your personal computer is not functioning currently, then one of the following  is happen.

1. The date and time on your PC shows wrong.
2. Your PC suddenly turn-off or does not start
3.Drivers stop working
4.You may start to get errors while booting that say something like “CMOS checksum error” or “CMOS read error”.
5 .Some weird hardware issues such as your computer not being able to locate the mouse, keyboard, or printer.

  

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