I have a similar project... well ok sort of similar, Monarch 10e-nc with dead controls. have every thing I needed to get it together but looking at the break out board I orders is is limited to 10 khz. (i really wanted and optical isolated bb) I'm thinking that is not fast enough for step and direction to the gecko drives. I was original planning to go Mach3 EMC => parallel port=> breakout board=> gecko drives
How did you do yours? The breakout board is simple enough that i could replace the slow optos with faster ones on the step and dir channels.