Hi It's been 10 years since Digital ->Compaq ->HP ->Mentec ->Calyx stopped selling RT11. I have been trying to get hold of RT11 v5.07 for hobbyist use. I contacted Calyx, Ireland who told me that they no longer license it and that I should make contact the various groups to see if anyone can help me on an individual (non commercial) basis. Thanks Dominic (pdp11 at barossafarm.com)