Integrated PCI Interface: Standard PCI Local Bus Specification Rev. 2.3 compliant. Built-In PCI Target Controller. Supports 33MHz and 66MHz Bus Operation Speed. Applicable to a high speed bus, PCI-X slots. Adopting Zero-Wait PCI to MIO Bus Conversion. Option Register provided for the control and information of UART. Downloads the Configuration header data from external serial EEPROM. Dual UART Interface: Dual-Channel UART(Universal Asynchronous Receiver and Transmitter). 256-byte Transmit/Receiver Deep FIFOs. Register Set Compatible with 16C554 and 16C654. Serial Data Rate of Up to 5.3Mbps & System Clock Up to 85MHz. Software/Hardware Flow Control & Xoff Re-Transmit Function. Global Interrupt & Control Pins for RS422/485 Auto Toggling. Fast UART Response Time, 24ns for IOR & IOW operation. Internal Diagnostic Capabilities. System Requirement: Window 7 32/64-bit / Window Server 2008 or 2003 32/64-bit / Windows Vista 32/64-bit / Windows XP 32/64-bit