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You could run Solaris[1]. They don't seem to provide versions older than 10.

[1] http://www.oracle.com/technetwork/server-storage/solaris10/d...

Elsewhere on the internet (without resorting to seedier places like torrent sites) you can find versions of SunOS 2.x/3.x/4.x as well as Solaris 1.x, 2.x, 7.x and 8.

A google search for "old unix emulator"[1] turns up a wealth of options.

[1] https://www.google.com/search?q=old%20unix%20emulator

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