As Kurt has already remarked, the page counts at https://dl.acm.org/citation.cfm?id=800009&picked=prox seem all but conclusive that only the abstract was published as part of the '73 SOSP. I have old paper copies of OSR & SOSP stuff in the attic, but I don’t think they start until ’75. Next time I’m looking there, which is probably months or more away, I’ll verify. Charlie

On Sep 28, 2018, at 6:55 PM, Warren Toomey <wkt@tuhs.org> wrote:

On Fri, Sep 28, 2018 at 05:20:53PM -0600, Nelson H. F. Beebe wrote:
Warren Toomey <wkt@tuhs.org> asks on Sat, 29 Sep 2018 09:04:44 +1000 for
a copy of the  original 1972/73 paper on The UNIX TIME-SHARING SYSTEM
that was published at the SOSP Proceedings of the fourth ACM
symposium on operating system principles.

The URL in this entry from unix.bib works for me:

Ah, but:

 remark =       "This electronic edition of this paper is a reprint of
                the version appearing in The Bell System Technical
                Journal 57 no. 6, part 2 (July--August 1978). In turn,
                that was a revised version of an article that appeared
                in Communications of the ACM, 17, No. 7 (July 1974),
                pp. 365--375. That article was a revised version of a
                paper presented at the Fourth ACM Symposium on
                Operating Systems Principles, IBM Thomas J. Watson
                Research Center, Yorktown Heights, New York, October
                15--17, 1973. Most of the differences between versions
                occur between the C. ACM version and the BSTJ printing;
                we incorporated updated numbers and material on
                portability.",

so not the original SOSP paper or the original 1974 CACM paper :-)

However, it's yet another version of the paper.

I've spent some time tracking down the various "versions" of this paper.
So far, I know of:

+ the mid-1971 draft, available at https://www.tuhs.org/Archive/Distributions/Research/McIlroy_v0/UnixEditionZero-Threshold_OCR.pdf
+ a later version which is in the Nokia Bell Labs archives, which I
 haven't been able to get my hands on
+ the SOSP presentation, still unclear if there was an actual paper
+ the 1974 CACM paper
+ the version in 6th Edition Unix, available at https://minnie.tuhs.org//cgi-bin/utree.pl?file=V6/usr/doc/unix
+ the 1978 BSTL version cited above

Are there any others that people know about that I've missed?

I would like to do some work on how the content changed over time.
The result would be, for me, an interesting paper to read but somehow
I think the readership base would be limited :-)

Cheers, Warren

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