If you've got more serial peripherals than you do ports, pick up the StarTech.com PCI4S550N. You'll add four 16C550 serial ports to your PC, giving you the ability to connect all the serial peripherals (like printers, modems, PDAs, POS devices, or ISDN terminal adapters) that you need. The high-speed card offers up to 921 Kbits/sec of fast data transfer and a 16-Byte FIFO buffer to optimize performance. With Plug-and-Play connectivity and IRQ-sharing, the card is easy to install.