[TUHS] Looking back to 1981 - what pascal was popular on what unix?

[Will Senn]

I'm reading in, Kernighan & Plauger's 1981 edition of Software Tools in 
Pascal and in the book, the author's mention Bill Joy's Pascal and Andy 
Tanenbaum's as being rock solid. So, a few related questions:

1. What edition of UNIX were they likely to be using?
2. What versions of "Standard Pascal" were in vogue on UNIX at the time 
(1981)?
3. What combinations of UNIX/Pascal were popular?

Thanks,

Will
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