Useful Links on assembly level instruction

In order to learn debugging using windbg, knowlege of assembly language is must. 

Please find few good links for basic assembly level instructions.

•Under the Hood (Feb 98):

 http://www.microsoft.com/msj/0298/hood0298.aspx

•Under the Hood (June 98):

 http://www.microsoft.com/msj/0698/hood0698.aspx