Astrotek PCI Serial Card, 4 x Fast Serial RS232 DB9 Port (Extension Cable and bracket for 2x serial), PCI specification v2.3 compliant, Supports both PCI 3.3V and 5V, PCI compatible Quad UART (16C550 type), Serial Port Data rates up to 4 Mbps per port , 16-byte transmit-receive FIFO (UART), Programmable baud rate generator, Modem control signals, 5, 6, 7, 8 bit characters selection, Even, Odd, No Parity, or Force Parity generations, Re-Map function for legacy ports, Drivers support MS DOS, Windows 98SE or above