Zybo getting started scenario (Invalid DAP ACK value: 0) in FPGA Posted December 10, 2016 31 minutes ago, bino said: I use Zybo too ... Just my 2 cents ... Are you use the logic push buttons (which generates terminal messages with this demo) or only try the switch buttons on the left down ? Diligent should pay you those 2 cents -- that clarified their vague instructions in Getting Started. Pressing the buttons, not the aforementioned switches, does indeed generate the text messages through COM16 into TeraTerm. Onto another one of their introductory scenarios. Hopefully no more minefields.