TK, all, Everytime i get a problem solved, another one comes in. Take  look at the attached block diagram.  The PC is now running linux puppy lucid (frugal), in a headless mode.  One power on/off switch starts everything  and the same switch turns it all off, thanks to linux puppy. The pc is running jOrgan (linux) ver. 3.14, which provides the desktop GUI and  combination action. jOrgan appears to function without problem when operating stops, couplers, pistons, set and cancel using the mous