The first projector I ever bought was a cheap 310mW RGV chinese box for a couple hundred bucks back in 2010. That was the projector that started this hobby for me. Recently I had decided to gut the thing and modify it to suit a particular project I'm working on. I was hoping to reuse the scanners that were in it since everything still works and I don't need anything special for this purpose. I did, however, buy a new ILDA board from Goldenstar that comes with an SD card slot. The SD card feature is essentially what I'm after however I am also replacing the lasers and driver with a higher powered 405nm laser. When it came time to wire up the new ILDA board to the existing scanner amps I noticed that the new ILDA board has a three wire output for the X scanner amp and a separate three wire output for the Y scanner amp, as I expected it would, however, the old amp only has a single three pin connector for the X and Y scanner inputs. I examined the amp, the old ILDA board and the old DMX board and it literally only uses 3 wires to control both axis scanners. Unfortunately this seems to mean that I can't use the new ILDA board with these scanners but now it has me wondering how the old design even worked. I assumed all scanners used separate +, - and ground wires for the signals to each amp. How then do they get the same function with both scanners sharing the same three wires? Perhaps what I thought was +, - and ground is actually +, ground and a feedback wire. In this case maybe the cheap design just has the two positive wires for the scanners and they share a ground while eliminating the feedback wire? I'm certainly a bit confused and disappointed. maybe I can find a way to wire in the new board if I knew how the old one worked. I'm curious to know other's thoughts. Thanks for the help.