Add 2 high speed rs 232 serial ports to your pc through a pci expansion slotr r compatible with any pc running windows dos or linux for simple integration into your applicationr data transfer rates of up to 1152 kbps for efficient serial device performancer easy to install and use with full step by step instruction providing a hassle free serial solutionr r the pci2s550 2 port 16550 serial card can be installed in an available pci slot to add two rs232 serial ports to your system a cost ef