RS232 RS-232 Serial Port COM & DB25 Printer Parallel Port LPT to PCI-E PCI Express Card Adapter Converter WCH382 Chip Supports 2.5Gbps PCI-E bus with full duplex channel. 1 external RS-232 DB9 serial port & 1 external DB25 parallel port available. Operating System: Windows 98 / Me / NT4.0 / 2000 / XP / Vista / Win7 / Win8 / Server 2003 / Server 2008 / Linux.