This PCI 2S1P Serial/Parallel Combo Card turns a PCI slot into two external 16C550 serial ports and one external EPP/ECP parallel port - an all-in-one solution that gives you both parallel and serial connections while taking up only one PCI slot. The serial/parallel combo card is PCI plug and play ready, and supports IRQ sharing for fast, simple installation. The combo card is supported in virtually any Microsoft Windows operating environment, (Windows Vista, XP, ME, 2000, 98, 95 and NT4), and is backed by StarTech.com's Lifetime Warranty and free lifetime technical support.