Section 1.2 BIOS and CMOS

Made By : Gagandeep Singh

A+ Hardware

What you learn today

CompTIA A+ 220-701 , Section 1.2,Explain motherboard components, types and

features.BIOS/CMOS/Firmware. - POST - CMOS battery.

What you learn todayBasic Input Output System (BIOS) overview.Complementary metal-oxide semiconductor

(CMOS).Accessing the CMOS settings from the BIOS

software.

Starting the computerEverything has to talk to computer

- Keyboard language translation. - Monitor language translation. - Hard drive language translation. - CD-ROM drive language translation.

If only there was some basic system for communicating between diverse components.

The CMOSComplementary Metal Oxide Semiconductor

(CMOS). - The type of memory.Backed up with a battery. - What’s the date and time settings.Stores the BIOS and configuration details.Doesn’t need to be very big - 128 bytes of content. - Integrated into the Southbridge.

BIOSBasic Input Output System (BIOS). - The Firmware (software)It is software that tell which monitor and

components are attached to computer.Every PC has a BIOS ROM.

The CMOS batteryMaintains the BIOS configurations.A bad battery will require a BIOS

configuration on every boot.Can often reset the BIOS configuration by

removing the battery.

Configuring the BIOS

The secret button Launching the system setup - Delete - F2 - Ctrl-s - Ctrl-Alt-S

POST

POST (Power on Self Test)Test major system components before

booting the operating system. - Main System - Video - MemoryFailures are usually noted with beeps or

codes.