I purchased this motherboard to replace my Mellow CDY V3 since memory is an issue with that board. Love that most connections to the Scylla is terminated on terminal screws with only a few crimp connections. The Scylla arrived quickly via Fedex at an additional cost since Canada Post was on strike. I had an issue configuring the end-stops assigned PIN numbers in the pin out diagram need to be corrected. Connection to my Huanyang VFD for the spindle was made easy but please note that the VFD needs to be configured for operation through firmware. My spindle is water cooled a thermistor circuit for monitoring the water temperature would have been a nice additional feature. Attached are a photo of the correct end-stop pins assignment and the VFD connections and jumper setting for the Huanyang VFD.