The MosChip ASIX MCS9901CV-CC is a single-chip PCI Express to four-port serial and parallel controller. It provides an efficient solution for adding multiple serial and parallel ports to computer systems through a PCI Express interface. The chip supports four RS232 serial ports and one IEEE 1284 compliant parallel port, offering versatile connectivity options for various industrial, automation, and communication applications. Each serial port supports data transfer rates of up to 921.6 Kbps, ensuring reliable and high-speed communication with serial devices. With its compact and integrated design, the MCS9901CV-CC simplifies board layout and reduces component count, making it an ideal choice for industrial, POS, and embedded applications requiring legacy device support.