I have problem to run the card under Windows 98 with use of drivers provided in vogonsdrivers.org under 'OPTi 82C931 DOS/Win3.1/Win9x Drivers and User's Manual'. I did installation using setup.exe under Windows then DOS related drivers were installed together with autoexec.bat modifications. In DOS mode card works, at least with drivers settings program. Then card is works.
Under Windows it is recognized as four 'OPTi Audio 16' devices but when I'm trying to point to unpacked drivers it can't see anything there. I also tried to switch card into non-PnP mode by jumper and do the installation by 'Other Devices'. In such mode Windows lists only IDE/ESDI device but even if I try to proceed with installation it miss .inf file from unpacked drivers directory.