The Moschip MCS9835 is a multi-function parallel and serial controller chip produced by MosChip Semiconductor Technology Ltd. It is commonly used to add additional parallel and serial ports to computer systems. The MCS9835 chip provides support for standard parallel port (LPT) and serial port RS232 (COM) functionalities, allowing for the connection of devices such as printers, scanners, modems, and other peripherals.

The MCS9835 chip offers enhanced performance and compatibility with various operating systems. It typically features multiple UARTs (Universal Asynchronous Receiver-Transmitters) and supports data transfer rates of up to 115.2 Kbps for serial communication.

The chip is commonly utilized in expansion cards, embedded systems, and other devices that require additional parallel and serial ports. It provides a cost-effective solution for expanding I/O capabilities in both industrial and consumer applications.