Model: RC56D2, WS5614ES2A
Operating System: Windows 95 & Windows 98 (Note: might work with other versions of this os.)
The unit identifies itself to Windows 9x Plug n Play as Rockwell RC56D2 Serial PnP, V.90, K56Flex, Voice, Speakerphone.
I just caught on PnP must stand for Plug and Play!
There must be other manufacturers who used this chip.
Hint to AOL users your software has probably detected you unit as Rockwell (generic) K56. It may perform slightly better if you change that (using Expert Add) to Rockwell (generic) V.90.