rutaba 0 Light Poster

i have choosen a topic of PCB and CONTEXT switching for my system programming course and i need some useful links to get data for the relevant topic like PCB with respect to System programming.. and context switching with respect to system programming.. there should not be the details of OS as i am restricted to Sys programming only..
So plz help me out if any one knows someuseful links as i serched alot but dint get any useful stuff..
plz its urgent ..
waiting for replies..
Regardz..