Brainboxes PX-257 2-Port PCI Express Serial Adapter - 2 x 9-pin DB-9 Male RS-232 Serial

PX-257 2-Port PCI Express Serial Adapter providing two RS232 serial ports. Up to 921.6 Kbps data transfer rates and the 256 byte deep transmit and 256 byte receive FIFOS, coupled with 1Mbit/s line drivers deliver uncompromising performance on your laptop/PC.