Model: Rockwell ACF II Fax+Data+Voice Modem
Operating System: Windows 95a (Note: might work with other versions of this os.)
I haven't tried it with XP but there shouldn't be any reason it won't work.
Click My Computer click Control Panel. In Control Panel click Modems then click Add.
Click Other for "What type of modem you are installing?" then click "next"
Click "Have Disk" then browse and open the RKV56D2.inf file.
Highlight the modem you want to install then click "next".
Select the port to which your modem connected then wait while files are copied.
Click "next" and follow the on screen instructions to complete.
Windows should also find the "Wave Device" driver and install it. It's rkv56d2w.inf.