I also have an Allen-Bradley 7320, a CNC machine tool
control. The heart of it is a 7300 "industrial processor"
16-bit minicomputer. I used it for a year or so to run a
retrofitted Bridgeport milling machine, but got tired of it
breaking down, which it did fairly often. Once I got EMC
from NIST running, the A-B was turned off for good.
http://pico-systems.com/images/S_AB7320D.jpg
Jon