Fully working Repetier 0.92.6 for the TronXY X5S stock Melzi board.
Check your X/Y/Z/EXT. motor directions. I cannot ensure the set directions are correct as you can plug the X/Y motors in to either port or install them in either position.
BTW , Repetier runs SOOOO much better on the 1284 for CoreXY than Marlin. plus all the other benefits Repetier has. I am unsure why anyone would want to run Marlin.. :)
Rep 1.0 to come as soon as I can get it to fit the 1284P. This may require disabling some features.