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Syba Single Port RS-232 DB9 Serial PCI-e 2.0 x1 Expansion Card MCS9922 SD-PEX15021MCS9922 is a single lane multifunction PCI express to I/O controller. It supports two serial ports and eight GPIOs. MCS9922 also provides an option for peripheral expansion through proprietary Cascade interface. The generic cascade interface allows interconnecting wit..