Graham, I think you are right, I even bought a 62pin connector (you only use about 8 of the pins) You remove the piggy back Denford i/p board to use this - but 'life' got in the way, (and I'm retired!). It seems If it wasn't for my oasis of engineering enthusiasts location, Aylesbury Bucks, it would of sold several times but enquiries all come from Manchester or further North. To be honest if only I had a little more space, as they don't come up very often, I would keep it! I have used a £8 breakout board and Mach 3 on a lathe conversion, with old parallel port XP computer hence my enthusiasm to get the mill going.
Not doing a hard sell but I have to be honest and say I will sell on a first come (with lovely cash) first served basis- but Mid March is not far away.
Best Regards
Pete