Not true guys? if you want compatibility out of a cheap card they say go for one using 'NetMos' driver chips onboard. I bought a second card that cost less than a tenner and it works with EMC2 fine and others have reported this chip to work well with Mach3 also. I used the details here http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?NetMos to help me decide which card to buy and Linux picked it up no problem. You have to specify the address in the config file and it was this guy off Ebay i got the card i used from http://myworld.ebay.co.uk/fullspeedit.