Temperatur controller / Extruder Board for EMC2 Reprap over Rs232

This is a Board i designed for my EMC reprap.
I have a cnc mill see here: http://robotik.dyyyh.de/cnc.html which is rather heavy. At the time im driving it with the reprap electronix when printig. The problem is, that the acceleration and speed of the axis is controlled much better by EMC2 then the reprap electronics can do. For a normal mendel which has low mass this might be not as important, but for a heavy machine it makes a differenze. Another anoying thin is, that i have to plug the stepp