Is it really a 25bit(!) connector or a 25pin connector? I suspect the latter since there's no A/D converter in the cable. As for the $90, that's not too expensive for such a complex device but you can build a 2 (or more) channel equivalent more cheaply.
Just buy a 25pin connector and 2 coax interconnects at Radio Shack. Cut off one end of each coax and solder the leads to the appropriate pins on the 25pin connector. I assume that the connection info is in the Sunfire docs.
Just buy a 25pin connector and 2 coax interconnects at Radio Shack. Cut off one end of each coax and solder the leads to the appropriate pins on the 25pin connector. I assume that the connection info is in the Sunfire docs.