how do same os works with various processors? dont their instruction sets differ? -explain

idata · ‎08-16-2009

i know only 8086 micro processor! s i know its architecture. and i am haunted by this doubt. how do an os works with all kinds of intel processor(pentium 2,3,4,dc,etc..). dont thier instruction sets differ? i think some basic common instructions are present in all the instruction sets. can any one explain all in detail or help in finding references that solve my doubt. refernces that explain architectures of all intel processors. any kind of help please.. just reply some way..

idata · ‎08-20-2009

Hi,

Now i am not expert by any strech of the imagination at all, but i've talked to a couple of friends and i think it may be because the base architecture of a lot of the CPUs both Intel and AMDs is the same (x86-64 ). i think this may be it, with the whole CPUID instruction as well. i haven't had time to look at this document yet(i've only just seen your post) , but i think it may help: http://www.intel.com/Assets/PDF/appnote/241618.pdf (cortesy of Aryan)

If get time i'll read it and see.

Do correct me if im wrong, as i say i really don't know THAT much.

Hope this helps someway at least i tried

idata · ‎08-21-2009

thanks a lot for the pdf. i'll start reading it. thank u again for nice pdf.