p.s. The "PDP Unix Preservation Society Home Page" at <http://minnie.cs.adfa.oz.au/PUPS/> (as well as <ftp://ftp.digital.com/pub/DEC/sim/>, which is a lot closer to us!) has binaries for PDP-11 UNIX (5th, 6th, and 7th Editions) for the simulator. PUPS also has how to get a source license from SCO for US$100. - Aron