The NetMos PCI 9835 Multi-IO Controller is a device that provides multiple input/output functions for your computer through the PCI (Peripheral Component Interconnect) bus. It is a part of the NetMos product family and typically used to add or enhance features like serial (COM) ports, parallel ports, and other I/O interfaces on a PC that may not have enough onboard ports. The PCI 9835 controller acts as a bridge between the computer's motherboard and additional I/O ports or interfaces.