The AOpen FM56-PM Controllerless PCI Modem is a PCI-based modem designed for use in desktop PCs, typically for dial-up internet connections or fax communication. The "controllerless" designation means the modem relies on the computer's CPU for processing, rather than having its own dedicated processor. To enable the proper communication between the modem and the operating system, you need the correct driver for your version of Windows.

The Windows driver for the AOpen FM56-PM ensures that your operating system can communicate with the modem hardware, allowing it to dial into the internet, send faxes, or use other modem-related services.