Unmarked modem with Rockwell Chipset - (PCI single-chip) RS56/SP-PCI R6793-11. After two days of searching and a process of elimination, I found out that my modem is a Jetway 1456HSF. Another two days of trying to gain access to the Jetway web site. Finally downloaded these drivers for the *HSF* version at 500 bytes a second.
My modem now works. YES!!!!!
I have also uploaded the NT version of the drivers to this site.