Animation Tutorials:OS

OS Concepts
http://williamstallings.com/OS/Animation/Animations.html
Would recommend to look at the following
Semaphore
http://williamstallings.com/OS/Animation/Queensland/SEMA.SWF
Process
http://williamstallings.com/OS/Animation/Queensland/PROCESS.SWF
Process Synchronization with semaphore
http://williamstallings.com/OS/Animation/Queensland/SYNC.SWF
Bounded Buffer
http://williamstallings.com/OS/Animation/Queensland/BB.SWF
Resources,Virtual Memory,Deadlock,File Management
http://courses.cs.vt.edu/csonline/OS/Lessons/index.html