The BU-65590I is a multi-I/O PCI card providing new levels of performance and flexibility for systems interfacing to a MIL-STD-1553 or ARINC 429 data bus. There are up to four dual redundant MIL-STD-1553 channels operating in BC, RT, MT, or RT/MT modes. Sixteen ARINC 429 receive channels and four ARINC 429 transmit channels operate in high/low speed with automatic slew rate adjustment. The card also contains six digital discrete I/Os, an IRIG-B time synchronization input, 2 RS-422/485 Serial I/O channels, and up to 2 RS-232 Serial I/O Channels. The combination of multiple I/O on one card saves valuable PCI sites on host computers.