Is there any way to debug sys files by ollydbg?

Sys files are kernel mode components for Windows (typically some form of device driver). They are loaded and executed (so to speak) in ring 0. Olly is a ring 3 debugger, so it can't even access them. Well, technically it could using the native debug control API, but that's a bit naughty. Anyway, you need a ring 0 debugger to debug kernel mode code. The ones I have experience of are Syser, SoftICE, and WinDbg. There's at least one other that I can't remember the name of. There's a thread on ring 0 debuggers on OpenRCE. I prefer WinDbg nowadays.

TRW2000

ok
so there is no way to use ollydbg?
TRW200 works under win98.

Googling (http://www.google.com/search?hl=en&q=ollydbg+drivers ("http://www.google.com/search?hl=en&q=ollydbg+drivers")) yields http://blogs.msdn.com/geffner/archive/2006/08/17/704412.aspx ("http://blogs.msdn.com/geffner/archive/2006/08/17/704412.aspx") as the first hit. You can try using the method described there to load your sys file into OllyDbg, but it probably won't help you that much if you're trying to do real debugging.

or you can use windbg and load the sys files as dump file look for doron holons blog in msdn a hole in my head

http://blogs.msdn.com/doronh/archive/2006/03/20/556053.aspx

well but like disa says all of them are usefull for preliminary analysis
and or tweking around

not usefull for real debugging

very nice eh thx by links