Date: 8/Nov/2012

BIOS and CMOS

What happens when you start the computer? How does a computer know when you input

something? Keyboard Monitor Hard drive Etc

Communication Language

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

BIOS (Basic Input Output System) The software | Setup | Firmware

F12/F2/etc in the startup of Computer Knows keyboards, monitor, videos, ram, hard

drive etc are known in the BIOS. Device Configuration Device boot priority Passwords Remove battery for reseting

Configuring BIOS Delete F2 Alt+Ctrl+Enter F12 Ctrl+S

Sample PhonenixBIOS Setup utility

PhonenixBIOS Setup utitlity Main Advanced Security Boot Exit

POST (Power ON Self Test) Test the Computer By Itself

CPU CMOS Video Memory Keyboard Harddrive Etc

Sounds like when there is no RAM and other codes

Thanks for watching! For any Questions or getting the Slides.

Nasrat Khalid Nkhalid@Auaf.Edu.Af Head of IT Department PDI/AUAF