Article 2513 of alt.sys.pdp11:
I got mine because Mr. Supnik convinced SCO to release free binary 
liscenses for V5,6,and 7.  I got V7, and it DOES run under a 34A (My DOS 
box had a virus :(  That's why Linux is better!)
Now the only reasons I keep DOS around is SailorMoon, and E11.

Anyway...

You can get more details of binary liscense junk from Minnie, and the PUPS.
(Lemme see how badly I can mess up this URL!)

minnie.cs.adfa.oz.au/PUPS

Hope this helps.