One of the D-Star implementations uses a Velleman K8055 usb experimenter kit and they ( Velleman) provide windows and Linux O.S. I/O stuff for it. It provides 5 hardware inputs and 5 hardware outputs off of a usb cable. For about $50.00 usd or so. That other project has migrated to serial port I/O instead but when multiple tx and cor are needed, the velleman I/O setup is maybe an option that can be integrated in??? Or not J From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Peter Elke Sent: Friday, February 18, 2011 1:31 PM To: app_rpt mailing list Subject: [App_rpt-users] Parallel port IO board? Hi All, Is there a circuit board design for running COS/PTT for multiple radios off the parallel port? It would make using consumer FOBs much simpler. It would need some PTT drivers and COS buffers. I thought there might be a cactus board or 3rd party IRLP board that may already in circulation. Pete