I have a AsRock N68-S which I want to use for DOS gaming but the board doesnt have any drivers for DOS. Is there any workaround to make the onboard sound work on this board?
Not possible. HD Audio does not work in DOS, as it is mainly software-driven (like a GDI printer or a WinModem). Even the earlier AC'97 did not work in DOS anymore, with the exception of some VIA implementations.