This is a driver I found for Win NT 3.51. It may work for NT 4.0. A customer just brought in a computer with this card and had four disk for this card. They were running Win95, that seemed to work fine.
The following files are found inside the driver download file.
|SISV.DLL||138.8 KB||11 Aug 1995|
|SISTAG||18 bytes||20 Aug 1994|
|SISV.SYS||31.5 KB||13 Oct 1995|
|SISV256.DLL||17.9 KB||11 Aug 1995|
|OEMSETUP.INF||27.8 KB||16 Oct 1995|