esmiller
I have just recently got EMC to run my system. I love it and it has lots of bang for the buck(its free). I found this guy on ebay. He will install BDI or any linux distro you want and send you a 450 Mhz computer pre loaded. This way I had a some assurance it would work when I got it. The computer was a woping 25 bucks plus shipping. You might want to check with him.
http://www.extantgroup.com/
I used debian BDI. I have included an attachment that contains all of the setting for the Xylotex controller except the input scale factor. You have to set that based on the number of thread per inch your ball screws or acme threads are. You must copy the file here /user/local/emc and overwrite the one provided with the system. I cut my parrel cable and took a multimeter and found every pin that corresponds with each wire. I then swithched wires 2 and 3 wires 4 and 5 wires 6 and 7. If its wrong it still works. Please feel free to email me if you need help.