Hi Lars,
Jim Gettys says he has old versions of X on tapes.
If you know Jim, you may want to prod him to shift the data to more
modern media if those tapes are old.
Rob Pike wrote of magnetic tapes he had which could no longer be read.
The coating had failed off IIRC. I tried to find the text but failed.
Perhaps it was on one of those Google+, Posterous, ... transient things.
--
Cheers, Ralph.