Well I can see Amirs point of view but i've found Mach to be very stable and have never had it lock up mid proramme.
I'm with Hood on moving away from the printer port. That machine will really move if you want it too plus with something like the Galil controller you would get the closed loop back similar to what the Meldas would have had.
That said you can close the loop in the drive on the modern Mitsubishi drives and they will take step and direction signals from the pp.
But as far as I know anything bigger than 1KW needs 3 phase in on the Mits!
Found these on ebay..
http://www.ebay.co.uk/itm/120587634024?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649Item number: 120587634024
They also do other sizes on there web sight.
John