Sure, probably lots of them. To name a couple: Many PDP-11 Unixes and BSD Unixes, see http://minnie.cs.adfa.edu.au/PUPS/index.html (a source license costs $100, CD-ROM is ~$5) FreeBSD Unix (descendant of 4.4BSD Unix), see http://www.freebsd.org CP/M (almost complete), see MAIN SITE AT : http://www.devili.iki.fi/cpm PRIMARY US MIRROR AT : http://www.mathcs.emory.edu/~cfs/cpm SECONDARY US MIRROR AT : http://CPM.INTERFUN.NET Heath HDOS for the H-89 used to be available, is it still? I'm sure other list members can chime in with other systems. Dave Jgzabol(a)aol.com wrote:

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Depends on how you mean that. Is that freely available, or available at a cost? I believe the source code is available for most DEC OS's including VMS if you want to pay for the license. Some DEC OS's such as RT-11 come with most if not all of the source. Others have already pointed out UNIX and CP/M stuff available. Zane | Zane H. Healy | UNIX Systems Adminstrator | | healyzh(a)aracnet.com (primary) | Linux Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | and Zane's Computer Museum. | | http://www.dragonfire.net/~healyzh/ |