Overview
GenX is a self contained 3D printer controller running Marlin and compatible with Pronterface.  The 4-Axis controller uses the A4988 driver, 20A head bed power mosfet, 7A extruder power mosfet, five limit switch inputs (estop) with opto input on X, Y and Z axis.  Complete source is provided.  GenX is an open hardware design.  GenX has two different power input connector to reliably support PCB heat bed systems.  Two other G Code embedded control applications run on GenX, GStep and GRBL.  Source code is provided for GRBL.

The picture below shows the GenX connector pin assignments.