Asynchronous and Serial: This PCIe parallel port expansion card features four 16C550 or 16C750 compatible asynchronous serial ports and an EPP ECP enhanced bidirectional parallel port. It can also add a CH438 chip to expand up to 24 serial ports. Convenient and Practical: The asynchronous serial port provides an independent 256-byte FIFO buffer for transmission and reception, supports IrDA infrared codec, and supports 8Mbps communication speed. Expanded Multi-Serial Port: The same chip can be configured as a four-channel serial port and parallel port for the PCI E bus, or a print port or a four-channel serial port and expanded multi-serial port. Supported Functions: This parallel port PCIe riser card supports SPP, Nibble, Byte, PS/2, EPP, ECP, and other IEEE1284 parallel port and print port working methods. It supports bidirectional data transfer and a transfer rate of up to 1M byte per second. Widely Compatible: The riser card supports Win 98SE, Win ME, Win NT 4.0, Win 2000, Win XP, Win Vista, Win Server2003, Win 7, and Linux. Host Interface: The riser card provides a two-wire serial host interface, which can be connected to a serial EEPROM device similar to 24C0X for storing non-volatile data. The device identification for the PCIe card can be set in the EEPROM device. Application Scope: This parallel port PCIe riser card can be used for PCI E bus RS232 serial port expansion, MiniPCIE high-speed serial port with automatic hardware speed control, serial port networking, RS485 communication, IrDA communication, parallel port and print port expansion, etc.