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Add four high-speed RS-232 serial ports to your computer with a buffered serial card from StarTech.com. The card uses a 16-Byte buffer in both the receive and transmit channels simultaneously to reduce the number of CPU interruptions and to improve system performance. This card is compatible with both 3.3 and 5 volt motherboards and uses DB9 connectors for a wide range of serial peripherals. Suitable for industrial applications, this card is compatible with a wide range of operating systems, including Windows, DOS, Linux, and Unix.