The EPP Host Interface (OX12PCI840) is a driver for a specific hardware component, typically associated with a PCI-based interface card from Oxford Semiconductor (now part of Microchip Technology). The OX12PCI840 is a chip used in various devices for providing an Enhanced Parallel Port (EPP) interface. This interface is often used to connect peripherals such as printers, scanners, and other external devices to a computer via the parallel port, offering faster data transfer speeds compared to older standard parallel port protocols like SPP (Standard Parallel Port) or ECP (Extended Capabilities Port).