Xray,
Well this is a very late posting on this subject, but here goes.   I recently got a New Hermes 3400 engraver, free!!   I ended up using parts of the original controller,  the motor driver board and the power supply. Everything else in the EP controller was deleted.
 I had to hand trace the motor driver board and develop a schematic, then rewired it to accept the parallel port inputs from Mach3.  
Very cheap conversion,   I am running upwards of 250 ipm.
Arnie