CMOS (complementary metal-oxide semiconductor) is a type of memory that stores BIOS and system configuration settings using a small battery as backup. It can be accessed by pressing Delete or Ctrl-Alt-Esc during POST to view and change settings. The main CMOS setup menu allows configuring options like system date/time, SATA devices, and security settings. If the BIOS password is forgotten, the CMOS can be cleared by shorting the CMOS jumper or removing the CMOS battery.
BIOS (basic input/output system) is the program a personal computer's microprocessor uses to get the computer system started after you turn it on. It also manages data flow between the computer's operating system and attached devices such as the hard disk, video adapter, keyboard, mouse and printer.
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2.
CMOS (complementary metal oxide
semiconductor)
It’s a type of Memory
Backed up with a Battery
◦ Lost battery results in lost configuration
Stores the BIOS and configuration Details
Time/Date
128 bytes of content
Integrated NOT Different
3.
Start the system
By pressing <Del> immediately after
switching the system on, or
By pressing the <Del> key or by
simultaneously pressing <Ctrl>, <Alt>,and
<Esc> keys when the following message
appears briefly at the bottom of the screen
during POST.
4. main setup menu
When you enter the Award BIOS CMOS Setup Utility, a Main Menu, similar
to the one shown below, appears on the screen.
5.
Standard CMOS setup - Options in the original PC ATcompatible.
Bios features -setup Award enhanced BIOS options.
Chipset Features Setup - Options specific to your system
chipset.
Power Management Setup - Advanced Power Management (APM)
options.
PnP/PCI Configuration -plug and Play standard and PCI Local
Bus configuration options.
Integrated peripherals- I/O subsystems that depend on the
integrated peripherals controller in your
system.Supervisor/User Password -Change, set, or disable a
password. Only the supervisor password permits access to
Setup. The user password generally allows only power-on
access.
6.
IDE HDD Auto Detection - Automatically detect and configure
IDE hard disk parameters.
Pc health ststus- displays the current cpu temperature, fan
speed and voltages etc.
Load BIOS defaults – BIOS defaults are factory settings for the
most stable, minimal-performance system operations.
Load setup defaults- Setup defaults are factory settings for
optimal-performance system operations.
Save& exit setup - Save settings in nonvolatile CMOS RAM and
exit Setup.
Exit without save -Abandon all changes and exit Setup.
7.
In the Standard CMOS menu you can set the system clock and
calendar,record disk drive parameters and the video subsystem
type, and select the type of errors that stop the BIOS POST.
8.
Date - set the system date.
Time- set the system time .
Sata 1-configures the connected devices to the
primary sata channel.
Sata2- configures the connected devices to the 2nd
sata channel.
E-sata-1 information- configures the connected
devices to the external primary sata channel.
System information – provide all the information
about the hardware. It also displays the total
memory in the system.
9.
Some time we set the password for the bios and
forget the password in that case we can clear the
cmos using two ways
Using cmos jumper
Removing and reinserting the cmos battery
10.
The easiest way to clear the CMOS is to short the "CLEAR
CMOS" jumper on your motherboard, assuming you have
one (most motherboards do).
Open your computer and look around your motherboard for
a jumper labeled like this. These jumpers are usually
located near the BIOS chip itself or near the CMOS battery.
11. Another way to clear the CMOS
Remove the cmos battery from the system
Switch on the system. In some cases you can access the BIOS
without the password as it has cleared the setting set the
default setting & save restart the machine.
Replace the battery & switch on the system again. Able to
access the BIOS the password.
