Computer Science - Computer Hardware - Discussion

Short for complementary metal oxide semiconductor. Pronounced see-moss, CMOS is a widely used type of semiconductor. CMOS semiconductors use both NMOS (negative polarity) and PMOS (positive polarity) circuits.

Since only one of the circuit types is on at any given time, CMOS chips require less power than chips using just one type of transistor.

This makes them particularly attractive for use in battery-powered devices, such as portable computers. Personal computers also contain a small amount of battery-powered CMOS memory to hold the date, time, and system setup parameters.

CMOS setup is a system program stored in ROM used to control working of system like:
determining boot sequence of evices attached to system.
blocking/unblocking ports(hardware ports like USB ).
establishing system password and so on .

The fixed disk error can be caused by any of the following possibilities:

1.Hard drive not setup properly in CMOS
2.Hard disk drive not detected
3.Hard disk drive not setup
4.Bad hard disk drive

The time and date settings will no longer be saved when the system is shut down. It is the duty of the cmos to save time and date when the system is shut down.

Simply remove the CMOS battery for a second then insert the CMOS battery again after this password and time are ready to reset again that is all.

I think we can remove the bios password by removing the jumper that is located on the motherboard.

If remove CMOS battery we can't use BIOS setting in our purpose. It seen that default settings.

CMOS battery is in a motherboard of a system its used to maintain a time and date in system.

How many type of CMOS do we have?

What is difference between CMOS setup and CMOS battery.

@Mani.

You need to remove the CMOS battery for 10 seconds and then attach it.