It's tough when the copyrights and ownership still exist. It sucks but is an unfortunate reality of the patent and copyright market in the states. Without soap-boxing there are a lot of companies that seem to be alive today only to buy the rights to old technology, get the patents, then sue other companies for royalties.
You might find it from someone here who has it and can offer it to you for no profit (sorta grey area.. at least not making money off of it) or searching some abandonware or software collections in various forms/sites.
Vintage PC I think is the keyword you're looking for, an IBM compatible version of Xenix?
Looking to acquire: IBM 5100, Altair 8800
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