PCI - Parallel and Serial Ports Duties Make available the original type of ports the original device had, in roughly the same positions These ports consist of: 1 Parallel Port 1 External 9-pin Serial Port 1 Internal Serial Port, for the modem Parts While still undecided, some candidates are available. ASIX MCS9901 PCIe to Dual Serial and Single Parallel Controller Prolific PL2303GC USB to Full UART IC Prolific PL-2303HX USB-Serial Bridge WCH CH340 USB-Serial chip