I have a 5vc750 mill with the acramatic 900 control, which is made by Siemens Electric.They have helped me in the past.Their number is 1-800-879-8079.Ask for tech Dave.Also they have a web page with info on comunication
to a computer.It is at sea.siemens.com/machine/support/mcA90fa1.html
Dale
DHECR250@aol.com