EMC and Rounded Corners

I have my CNC plasma cutter working. I cut the first pieces last night. All
went pretty well for a first try with a "live" torch.... but, I programmed
sharp corners and EMC rounded them all with about a 3/8" radius. I am
cutting at 200 IPM with 8in/sec^2 accel. Is the rounded corners due to slow
accel or is it a constant contouring feature? If it is a feature how do I
disable it? I realize the torch will burn the corners off some, but there is
definitely a tool path issue here.

TIA
Terry