Hi The good news is that we've finally fixed the problem and now the MC68360 P1 boots as it should. It is able to use the 8-bit output port to help with debugging. The problem turned out to be the XFC capacitor is tuned to the main clock input and varies with clock speed. We were trying to use a slower clock (4 MHz) than recommended for debugging while the sample schematic uses a 25 MHz clock and an XFC capacitor. Switching from the 4 MHz clock to the recommended 25 MHz clock and it boots just fine. The QUICC documentation is pretty good but enormous and complex. It is going to take a while to work through it all though. Thanks and have a happy holidays! Andrew Lynch PS, if anyone is experienced with MC68360 and would like to help out with the MC68040 SBC project there are a couple of prototype PCBs left. We could probably use another set of eyes on this project to help catch some of these issues. You'll need some prototype debugging experience and a lot of patience. We aren't going to start on the MC68040 companion mode until we get the MC68360 QUICC board working completely.