Version 2.3.4 of SCO Xenix System V, running in the Qemu emulator under OSX.
<p>
This is from the "old", non-evil SCO, before they were bought by Caldera and became the new, evil SCO.</p>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/mrbill/">Bill Bradford</a>
CC BY 2.0
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