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