Luke, That is very interesting. Here's a page on Tiger 320 PCI controller http://www.tjnet.com/chips/tiger320.htm Data sheet is here http://www.tjnet.com/software/download/data_sheets/Tiger320_data_sheet.pdf >From the data sheet ... The tiger320 serial port interface provides a symmetrical full duplex communication link. But this is not a normal asynchronous serial data port as we are used to dealing with in UARTs. This is a synchronous serial port with a clocked interface, it has a data clock and a frame synchronization clock. This port has more in common with an audio device like codec than a uart. And it can in fact connect to codecs. This chip was really designed for SLIC or DAA connections to the telephone network for modems. That makes sense because the manufacturer make VOIP gateway products. It would seem then, that the synth card uses this chip primarily for the PCI hardware interface. Most likely there is some kind of microcontroller on the other side of that synchronous serial port. It would use synchronous serial programming for communication. I have no idea how to determine anything further than this without the hardware. -- Doug
