You might be able too use a BOB (Breakout Board) to get you wired up but, not being familiar with the MAX NC products -I took a look at the site.
This might be your challenge:
"If the controller is to be used with other driver software, it requires only 2 output lines per motor from the parallel port,
in quartered mode, and 2 input lines total for feedback. 4 axes can be driven with a single parallel port."
Italics mine -- That from the 10CL machine on the website --
They don't show whats in the box or offer a wiring scheme - so you'll have to sort that out. If they are offering 6 axis control software - bet they'll sort out a way to keep their customers by offering an upgrade box too.
Not much help - sorry - But, with MACH3 and other controllers - you just add a BOB - I have "ganged 2 sets of 3 axis Xylotexs that way.
:cheers: Jim